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21 mhz half wave GP Antenna - 21 mhz half wave ant -very low radiation angle - full size and light weight- all coax matching system - decoupling care to prevent low angle radiation degrade
[ Hits: 3104 | Votes: 6 | Rating: 2.17 ]

3 Element Yagis Antennas for HF ^updated ^pop - All these plans use the DK7ZB match
[ Hits: 27604 | Votes: 69 | Rating: 4.94 ]

50MHz J-Pole Antenna ^pop - Need a general purpose antenna on the magic band? The J-Pole is an easy-to-build and inexpensive device that provides an omni-directional vertically polarised antenna without the need for a ground plane. In technical terms, it is an end fed vertical 1/2 wave which is fed via a 1/4 wave matching stub.
[ Hits: 33824 | Votes: 18 | Rating: 7.05 ]

50MHz-Yagis by DK7ZB - 50MHz-Yagis with a new match, all lengths from 0.6-12m
[ Hits: 6340 | Votes: 84 | Rating: 8.49 ]

SWR: Maximum allowable VSWR - VSWR (voltage-standing-wave-ratio) represents the degree with which an antenna is "matched" to the system impedance. Most modern antennas do not require any tuning for optimum performance. VSWR is one of the easiest parameters to measure and VSWR meters are becoming very popular antenna installation tools
[ Hits: 1240 | Votes: 3 | Rating: 3.33 ]
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.
[ Hits: 3312 | Votes: 5 | Rating: 6.4 ]

Quad or Loop antenna - Information about quad and loop antennas, matching tips, differences on polarization and impedence by PA0FRI
[ Hits: 920 | Votes: 3 | Rating: 4.33 ]
Matching Waves, VSWR at work - When the radiation resistance (voltage to current ratio) of an antenna is the same value as the characteristic impedance of the transmission line (voltage to current ratio in the line), all of the electrical energy transmitted down the line is taken by the antenna and radiated into space in the form of a radio wave.
[ Hits: 507 | Votes: 0 | Rating: 0 ]

The EZ-Tuner - The "EZ-Tuner" is a homebrew automatic legal-limit antenna tuner that covers all amateur HF bands from 160-10 meters. Using a T-network design and controlled by a BASIC Stamp BS2sx microcontroller, the EZ-Tuner will match at least a 16:1 VSWR for either unbalanced or balanced transmission lines.
[ Hits: 5569 | Votes: 1 | Rating: 9 ]
S-MATCH Universal ATU - PA0FRI's "S-MATCH ATU" published in RSGB's RadCom March 2003). The Balanced Universal ATU Photographs of ZL2ML's S-Match were added.
[ Hits: 5463 | Votes: 15 | Rating: 6.14 ]
Emtech ZM-2 Antenna Tuner Kit - The Emtech ZM-2 Antenna Tuner is a nifty little portable transmatch for QRP (low power). It utilizes the well-known Z-match circuit, which is especially useful for balanced antennas (like dipoles and loops).
[ Hits: 3431 | Votes: 6 | Rating: 5.33 ]
A Z match tuner for HF bands - This small tuner by KC8AON has only 2 controls and will tune almost anything from 10 to 80
[ Hits: 9798 | Votes: 5 | Rating: 4.6 ]
A Portable Antenna Matching Unit - A small HF antenna tuner project for qrp operations. Includes circuit diagrams pictures and test results by GW4ALG
[ Hits: 15347 | Votes: 7 | Rating: 5.14 ]
Balanced Line Tuner - A small Z-Match tuner, BLT, Balanced Line Tuner is a simple Z-Match tuner that works from 10-40 meters
[ Hits: 917 | Votes: 0 | Rating: 0 ]

D3 Antenna for Field Day - D3+ High Performance Antennas for Field Day. This article describes versatile broadband wire antennas. These antennas will double your effective radiated power over a dipole, will be easy and inexpensive to build and install, and will be simple to match.
[ Hits: 2644 | Votes: 7 | Rating: 4.86 ]

K0BG's ham radio mobile operator web site - This site is dedicated to mobile amateur radio operators, old and new alike. Whether you are into HF, or VHF operation, I trust the information presented will increase your enjoyment of our great hobby. With safety as a byword, there are articles on amplifiers, antennas, bonding, impedance matching, installing hardware, mobile equipment, noise and RFI abatement, wiring, and much more. I do my best to keep these articles up to date, and easy to follow.
[ Hits: 4856 | Votes: 10 | Rating: 8.7 ]

Smith chart - Match & display imped of antennas, can graphically visualize and compare two sets of measured impedances simultaneously.
[ Hits: 3589 | Votes: 9 | Rating: 4.12 ]

Resistor Finder - Resistor Finder is a program that allows the electronics designer or hobbyist to find a combination of 2 resistors that, when connected in parallel, will provide the best match to a desired resistance.
[ Hits: 1195 | Votes: 7 | Rating: 3 ]

Ham Profile - This database is not a logging program. It is intended to collect information about the HAMs that you know. You just record the call sign and name of a HAM that you meet. Later you can use QRZ to look up the call sign to validate that it matches the name.
[ Hits: 966 | Votes: 0 | Rating: 0 ]

Fcc Lookup System - The FCC Lookup System software uses the standard FCC data files in an advanced lookup system for matching a call sign to a user. The software creates index files to allow rapid searches without modifying the FCC data file. Available for both Windows and Linux.
[ Hits: 1164 | Votes: 2 | Rating: 1 ]