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.

Directional arrays - About collinear array antennas

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

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

Verticals. Ground systems and some history - Article gives a good overview of the basics and reflects the accepted wisdom from BC antenna work.

VHF antennas, construction and use - Article by VU2GT about VHF antennas, how to evaluate performances and models.

VLF-LF and the Loop Aerial - The article discusses the theory of loop aerials for receiving and how they reduce the level of local noise by Lloyd Butler VK5BR

VSWR Explained - An interesting article on Voltage Standing Wave Ratio vs Current Standing Wave Ratio by EPARA

VSWR Reactive Power - Many antennas and antenna designers neglect the true cause of loss. The major problem using short antennas is the reactance, not the length

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

Which Aerial ? - Article prepared by the Medway Amateur Receiving and Transmitting Society and details their testing of various wire antennas.

Why a Beam Antenna - Some basic antenna information for the newcomer

Why an Antenna Radiates - How antenna works by ARRL

Why Are Antennas Built to Look Like They Do? - Basic anctenna theory, general information on antennas

Why is 50 ohm coax so special - Why is 50 ohm Coaxial Line so Special Anyway?

Why Radials ? - Butternut article on radials usage on vertical and ground plane antennas

Why Vertical Antennas? - K2KW notes on verticals antennas

Yagi antenna Q Factor - How you can calculate antenna Q factor for use in antenna quality evaluation instead of use of VSWR bandwidth.