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

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

Receiving Loop Theory - N4YWK - Sensitivity of multi turn receiving loops William E. Payne, N4YWK

Restricted Space Antennas Notes - W5ALT Antenna notes for a dummy dedicated to restricted space antennas

RMS power - How it's misused and misunderstood, and why it's not useful.

Selecting a Multi-Band Vertical - Choosing a vertical antenna. Buying guide to amateur radio HF vertical antennas by Bencher inc

Sensitivity of Multi Turn Receiving Loops - Magnetism is manifested as a 'field of vectors', that is, any point in the magnetic field has not only a magnitude, but a direction in space. The four Maxwell equations describe how electric and magnetic vector fields behave and interact.

Single-stub matching - Single-stub matching of transmission lines to loads A worked example

Sloper Antenna Tests - Mark Connelly - WA1ION tests on slooper antennas

Small antennas and radiation resistance - Small antenna, what causes loss and how to increase radiation resistance in small antennas., A description of loss and radiation resistance.

Smart Antennas Tutorial - Smart antennas or the adaptive antenna array and smart antenna technology used with SDR, cognitive radio, MIMO, and other new technologies.

Smith Chart Basics - Smith Chart it is a graphic tool for solving transmission lines problems

Some plain facts about multiband vertical antennas - There is considerable confusion as to what exactly a multiband vertical antenna is. The confusion concerns the method of feed, how much mismatch one can expect, how many radials are required, how the particular antenna is built for multiband use, plus some other points.

Speedometers SWR Meters and Smith Charts - Have wondered why a Smith chart has such strange grid lines. Believe it or not, there is a logical progression from Speedometers to Smith charts that will make the Smith grid crystal clear.

Stacking for 50MHz - Summary of discussion on stacking antennas on six meter band

Stealth Attic Antennas for DX and Contesting? - Considerations on using attic antennas for dx anc contesting operations.

SteppIR Element Length Study - Four EZNEC studies for the 3 element SteppIR for 17 meter

Switching Solutions - Creative Contest/DX Station Switching Solutions by W7VP on NCJ

SWL antenna distribution system - A methodology for connecting multiple LF/MF/HF receivers to a single antenna via readily available and inexpensive 75-ohm TV cable. Custom made baluns and splitters provide impedance matching and prevent interaction between receivers.

SWR Table - Power loss table by SWR values

SWR with non-resonant antennas - SWR with multiband and non-resonant antennas

T-Match Construction - The T-Match with its balanced feed point is one method of feeding a Balanced Dipole.

Techlib.com Antennas - Introduction to homebrewing antenna, for AM FM band reception

Testing with the Loop Antenna - NRSC AM bandwidth measurements with the loop antenna

The Coaxial Line - Impedance matching, Transmission Lines, Characteristic Impedance, VSWR & Mismatch and Antenna Losses

The Crossed-Field Antenna - Please be aware this article introduces a completely new concept in antenna theory. In fact, this is considered the most important development relative to antennas in this century. It is so pervasive that a series of articles are required to cover the concept and its applications to the depth and extent it deserves. This is the first publication about the Crossed-Field Antenna

The decibel - dB the measure of performance explained at radioworks.com

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.

The Ferrite Rod Antenna - Theory of the ferrite rod antenna

The humble Yagi or should that be Uda - Article about Yagi-UDA antennas

The Impact of Current Distribution on Array Patterns - Technical Correspondence, QST, July 1990 - Why even "perfect" phased array element currents don't produce perfect patterns.

The mark 2 Crossfield Antenna - The mark 2 Crossfield Antenna was described in Sprat 76 by Alec, GD3HQR

The mystery of radials - Effect of radials on the efficiency of antennas.

The Petlowany Principle - Spipral antenna principle by a concept of Bill Petlowany, K6NO. Tak Antennas are based on this principle, using spirals as dipole linear wires.

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.

The Smith Chart - Understanding smith charts, an introduction to smith charts and it's advantages.

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

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

Tuning Your Antenna - Getting the best performance from your investment

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.

Understanding Antennas For The Non-Technical Ham - A Book By Jim Abercrombie, N4JA. Reason for writing this book is to educate you so you can make an informed choice concerning the best antenna for you. Another reason is to dispel the many antenna myths that circulate in the amateur communit

Understanding Radiation Patterns - Understanding and using antenna radiation patterns

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

Understanding SWR by Example - Take the mystery and mystique out of standing wave ratio QST Article by K5DVW

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

Using MMANA-GAL for antenna modelling - G0KYA MMANA-GAL presentation and samples

Vertical amtennas among the trees - Experiments on vertical antennas among the trees by ik2egl

Vertical and Above - Using vertical on six meters band and above, by Peter Schleuss, HB9RUZ

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.

Vertical stacking of HF antennas - Benefits of stacking two HF antennas vertically

Vertical vs Horizontal antenna separation - Isolation vs antenna separation an interesting article by WA6ILQ