Theory

Antenna basics - Basics by From Ian C. Purdie, VK2TIP

Balun Theory - The word balun means balanced-unbalanced: it's used to adapt a balanced device to an unbalanced one

J-Pole theory - The J-Pole antenna is an omnidirectional antenna that can be used for base, mobile and field day stations. It does not need a ground plane, radials or a complicated matching system. The J-Pole can be cheaply, simply and quickly constructed using a variety of techniques, some of which are discussed in this article.

Antennas basics - An antenna study guide by NZART, cover basic topics like dipoles, wave lenght calculation, baluns, beams, dummy loads, and measurements.

Install a PL-259 on an RG-8X - A better way to install PL-259 connectors on RG-8X type coax by Dan Richardson, K6MHE

Basic Antenna Theory - Basic antenna theory by sub-TV

Antennas and Grounds for apartments - Suggestions on finding RF ground when you live in an apartment and you want to setup an antenna

Do You Need an Antenna Tuner - Maybe yes, maybe no. It all depends on the type of antenna and feed line you're using. QST Article in pdf format

Dipole Height - How High should my Dipole be? Dipole Antennas and the effect of height above ground

Why an Antenna Radiates - How antenna works by ARRL

Grounding system - Perhaps one of the most over looked aspects of setting up a listening post is a ground system

How to Construct a Dipole - Basic and illustrated article on building wire dipole antennas. This page is about "how to build a dipole antenna"

FAQs - Basic Antenna Theory - Faqs and antenna basics

Types of multiband antennas - Types of multi-band antennas for the HF bands, from the horizontal end fed wire, to g5rv, log periodics, trap dipoles, vee beams and rhombic antennas.

Antennas : theory and designs - Thierry LOMBRY, ON4SKY, develops in several long articles all you need to know about antennas, their design and performance, for both amateurs and SWL

W1GHZ Microwave Antenna Book - The W1GHZ Online Microwave Antenna Book online

Understanding Standing Wave Ratios SWR - We worry a lot about Standing Wave Ratio (SWR) in amateur radio since SWR is one indication of how well our antenna system is working. Most HF transceivers and antenna tuners have built in SWR meters. SWR is a measure of a transceiver’s output power verses the portion of that power reflected by the antenna system By Ken Larson KJ6RZ

Low Noise Antenna Connection - Reducing noise to your antenna can gain your aerial performance, learn how.

Antenna Noise and Signal Cancelling at LF - By using the signals from two antennas, controlling their relative amplitudes and controlling the phase of one of them, unwanted signal or unwanted noise can be phased out. Circuitry is described which uses the signal from a wire antenna to provide selective cancelling against the signal output from an LF loop antenna.

G5RV Measurements - Measurements and characteristics of a G5RV Antenna, including effect of the transmission line as part of the antenna and contributes in a large way to it's multi band characteristics

Amateur Radio Antennas: Ground Theory - Perfect ground vs. poor ground. What is the difference? How does the ground influence the DX-gain?

Antenna & Mounts - Mobile antennas, how to install antennas in the roof of a vehicle and how tune antennas.

Rainbow Antenna Analyzer - A small and inexpensive measurement device designed to determine antenna performance across the amateur bands through use of automatically collected SWR readings

Using Delta Matching on HF Beams - Using delta match with HF antennas design

Dipole Calculation - Determining your proper length for the open half-wave dipole antenna

The Quarter Wave Sloper or the Inverted-V Dipole - A question that seems to be asked nearly everyday is, which is best, the quarter wave sloper or the inverted-V dipole? PDF File by AD communications.

HF antenna for high rise dwellers - If you have ever tried transmitting on HF from a tall block of apartments, where it's just not possible to erect a substantial aerial system, then this article is for you by Mel G4WYW

Loading inductors in mobile antennas - Mobile antennas, loading coil current, and loaded antennas. efficiency and electrical rules. Loading inductors used in mobile HF antennas.

Coax velocity factor - Coax Cables velocity factor article in pdf format

Directional arrays - About collinear array antennas

Actual Antenna SWR - Easy for calculate formula which could be a wake-up call for you. The SWR value at the input of antenna cable is not a actual SWR of your favorite antenna.

To Trap or Not to Trap - An interesting article on traps, pros and cons of trapping by W4RNL

Marine corps antenna handbook - U.S. Marine Corps in PDF format

Another way to look at vertical antennas - What iss the difference between a dipole and a vertical? Maybe not as much as you think. Come along and try another point of view.

The DK7ZB-Match for Yagis - Simple, easy to built match developed in 1995 for Yagis with resistitive loads of 12.5, 18 and 28 Ohm.

Antenna Transmatch Tips - Tips on tuning antennas using Antenna Tuning Units also called ATU. This article explains the functions and ills of tuners, along with some guide- lines for building an ATU.

Radiation and scattering - Basic antenna theory, Antenna directivity and effective area, Antenna arrays

Trap antennas, coaxial trap, coax dipole antenna loss resistance - Testing and comparison of traps and trap antennas

Vertical plane antennas' beaming comparision - Animated quad and yagi comparison. You can see antennas' characteristics behavior in a vertical plane with changing of the height.

Low reactance multiband center feed wires - An antenna system is more easily interfaced to a radio when the input reactance at the feedline terminals is low or close to series resonance

Coaxial cable dipole for 80m - Here are some simple antennas you can build along with calculators to help you get the right length.

50MHz Power Splitters - Splitting an antenna between two receivers or in use as the phasing harness in stacked antennas where there is a need to equally split the power from the transmitter between two antennas

Antenna basics  ^pop - Basics by From Ian C. Purdie, VK2TIP

Antennas and Grounds for apartments  ^pop - Suggestions on finding RF ground when you live in an apartment and you want to setup an antenna

Antennas basics  ^pop - An antenna study guide by NZART, cover basic topics like dipoles, wave lenght calculation, baluns, beams, dummy loads, and measurements.

Balun Theory  ^pop - The word balun means balanced-unbalanced: it's used to adapt a balanced device to an unbalanced one

Basic Antenna Theory  ^pop - Basic antenna theory by sub-TV

Dipole Height  ^pop - How High should my Dipole be? Dipole Antennas and the effect of height above ground

Do You Need an Antenna Tuner  ^pop - Maybe yes, maybe no. It all depends on the type of antenna and feed line you're using. QST Article in pdf format

Install a PL-259 on an RG-8X  ^pop - A better way to install PL-259 connectors on RG-8X type coax by Dan Richardson, K6MHE

J-Pole theory  ^pop - The J-Pole antenna is an omnidirectional antenna that can be used for base, mobile and field day stations. It does not need a ground plane, radials or a complicated matching system. The J-Pole can be cheaply, simply and quickly constructed using a variety of techniques, some of which are discussed in this article.

50MHz Power Splitters - Splitting an antenna between two receivers or in use as the phasing harness in stacked antennas where there is a need to equally split the power from the transmitter between two antennas

A Collection of Smith Chart Resources - The Smith Chart was originally created many years ago as an RF engineering aid by Phillip Smith of RCA.These pages includes extesnive documentation on smith carts.

A Modern Thermocouple Ammeter - Thermocouple ammeters are very rare these days, but the job they were perfect for - measuring antenna currents - is still a modern requirement especially in respect to groundplane currents. By David A. Reid PA3HBB G0BZF

A NoTuner Antenna - SM5JAB anotenna made with a dummy load and a long wire.

About broadband - What you gain and what you lose. While broadband and electrically small antennas may look attractive on the surface, they are by necessity compromises and usually don’t work as well as tuned antennas.

About directional antennas - Directional antennas a beginners explanation

About horizontal yagi antennas - SM6EHY on horizontal yagi antenna

About trap antennas - Negatives sides of using trap antennas

Actual Antenna SWR - Easy for calculate formula which could be a wake-up call for you. The SWR value at the input of antenna cable is not a actual SWR of your favorite antenna.

Advanced active VLF Loop - Article on using loop antenna in very low frequencies

All HF Band Antennas - F6ITV consideration on HF Antennas, from trap wired anternnas, to center feed antennas.

Amateur Radio Antennas: Ground Theory - Perfect ground vs. poor ground. What is the difference? How does the ground influence the DX-gain?

Analyzing Three Antenna Analyzers - On this page W8WWV present some measurements he made with three of the popular antenna analyzers. MFJ MFJ-269, AEA CIA-HF, Autek RF-1

Another way to look at vertical antennas - What iss the difference between a dipole and a vertical? Maybe not as much as you think. Come along and try another point of view.

Antenna & Ground Help - Radials & Counterpoise

Antenna & Mounts - Mobile antennas, how to install antennas in the roof of a vehicle and how tune antennas.

Antenna Cable Loss and SWR - Calculate Cable Loss from SWR and reverse. Text file with only two simply formulas

Antenna Diversity - Single antenna with multiple polarization for diversity, diveristy receivers and propagation effects on signal polarization

Antenna Efficiency - K0BG article con antenna efficiency covering topics like radiation resistance, coil losses and ground losses, other kind of losses. How calculate efficiency and Bandwidth Notes

Antenna Fundamentals - Adalet wireless document on antenna basics in a four pages pdf file

Antenna Glossary - From Radiall-Larsen Antenna Technologies website technical reference documents

Antenna Height Theory - Antenna mounting height, the higher the better? Learn how radiation pattern change, and decide if you need an higher or a lower angle for your dx needs.

Antenna Measurement Theory - Introduction to Antenna Measurement by orbit /fr pdf file

Antenna Measurements - The electrical characteristics of an antenna that are of interest to obtain by direct measurement are the frequency at which the antenna is tuned, the gain and radiation pattern

Antenna Modeling Files - A collections of antenna models submitted to arrl and can be used with NEC-4 or Yagi Optimizer modeling programs

Antenna Modelling - Antenna modelling notes, including wich antenna modelling software choose and where to find useful resources for antenna planning and home-brewing.

Antenna Myths - It is best not to know very much, than to know a lot of things which aren not true.

Antenna myths and mysteries - A practical approach to HF and VHF antennas, plus antenna myths and mysteries. By Terry Graves, K7FE

Antenna Noise and Signal Cancelling at LF - By using the signals from two antennas, controlling their relative amplitudes and controlling the phase of one of them, unwanted signal or unwanted noise can be phased out. Circuitry is described which uses the signal from a wire antenna to provide selective cancelling against the signal output from an LF loop antenna.

Antenna Polarization notes - Antenna polarization is a very important consideration when choosing and installing an antenna. Most communications systems use either vertical, horizontal or circular polarization. Knowing the difference between polarizations and how to maximize their benefit is very important to the antenna user.

Antenna resonance and bandwidth - About antenna or aerial resonance and bandwidth and the impact of RF antenna resonance and bandwidth on radio communications systems.

Antenna Selection Made Easy - This page will help you answer important questions about antenna selection before you talk to a supplier. After reading this paper, you should be able to better determine the most important parameters you need to know for your antenna selection criteria.

Antenna Theory - A discussion of antenna theory by Paul Graham, K9ERG , one of the better antenna explainations out there

Antenna Theory - Introduction to Electromagnetics, Maxwell's Equations, Transmission Line, Models, scale modeling, constants

Antenna tips for the beginner - Some rules of thumb for beginners, with a QRP approach, by James R. Duffey KK6MC/5

Antenna Transmatch Tips - Tips on tuning antennas using Antenna Tuning Units also called ATU. This article explains the functions and ills of tuners, along with some guide- lines for building an ATU.

Antenna-Theory.com - A source of knowledge for learning about and understanding antennas. The goal is to present a comprehensive tutorial on antennas.

Antennas 101 - Dipoles, Doublets and Verticals by Rob May NV5E

Antennas : theory and designs - Thierry LOMBRY, ON4SKY, develops in several long articles all you need to know about antennas, their design and performance, for both amateurs and SWL

Antennas and transmission lines - A very exaustive article on antennas and transmission lines. Covers many aspects of antennas and feed lines, in spanish

Antennas and Transmission Lines Myths - Antennas, Transmission Lines, Tuners - Myths, Mysteries and Qualifiers By Don Wilhelm W3FPR