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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.

YF1AR 80 to 40 meter vertical antenna project

A home made QRSS beacon project for the 10 MHz by VK2ZAY

The Upside-Down Umbrella Antenna by Don Keith N4KC

Antenna switch at K6XX

Homebrew a 1/4 wave 80 meter vertical using aluminium tubing

A 10 Bands mobile antenna for about the price of 2 mobile monobanders.

A must read guide for all new and old operators. This document was originally written with the prime focus on DXing and pileup behavior. Suggestions by proofreaders have been implemented; the document is not as narrowly focused anymore as originally intended. It contains hints, tips and tricks for newcomers as well as old-timers. Additionally there are VHF/UHF operational matters, DX Cluster ethics, COPS, Conflict Situations and more.

A quick vertical for 160 meters portable use

The St. Louis Vertical Revisited by Dave Gauding, NF0R here are a few ideas and observations on the St. Louis Vertical

2 element reversible verticals, small footprint, big results.

A 3.5 Mhz top loaded vertical antenna built using 2 elevated radials by DJ9RB

A self supporting vertical antenna for 80 meters by W9OY include pictures and construction details

Using the T2FD antenna for shortwave listening by AB1KW

Local and DX contacts from tight spaces, it works from 40 to 17 meters

DF9CY Active Magnetic Antenna project

Portable magnetic loop antennas - G4TPH Mag-loop antennas Reviewed in PW and RadCOM, Both QRP and QRO, Portable. The only Magloop on the market that is fully portable

A telescopic pole that you adjust to suit the band you're working on , tested on 40 20 and 15 meters band by M0PZT

Interactive CW Keyer the best for DXers

Automatic Picture Transmission (APT) is used by Satellites to enable a fully automated unattended reception of the transmitted pictures.

Coax is a very important part of a satellite station. It is almost as important as the antennas you choose. This article discusses choosing coaxial cables for satellite communication, emphasizing factors like line loss. It compares types such as RG-8, RG-58, Belden 9913/9913F, LMR-400, and hardline, highlighting their impact on signal preservation.

Amateur Radio and Commercial Radio licencing exam practice. You can visit the Technician, General or Extra license pages where you can pick and choose the topics to practice so you can build up to a complete exam.

AG4RQ's Homebrew Single-Lever CW Paddle

Mailing list for people who own or are interested the various Realistic DX series radios from Radio Shack/Tandy. The DX-160 and DX-302 are frequenty discussed.

40 meter vertical antenna construction, a shortened easy-to-build vertical, with no-radials, made from surplus military camouflage poles

A vertical antenna specifically designed to work with the 80 meter CW beacon keyer

A vertical dipole for 10, 15, 20 and 40 meters made adapting two Hustler Model 6-BTV antennas by w6sdo

A home made vertical polarized moxon antenna for 144 MHz, includes dimensions, antenna pattern, SWR and antenna gain plots by WB5CXC

Specializes in antique radio schematics and capacitors. carries antique radio schematic diagrams and electronic circuit service information for american, canadian and european antique radios.

Web Site of CB Radio station from Vernadsky Research Station on Galindez island 140URL9909

Yet another G5RV antenna plan to build a G5RV Antenna for 80 to 10 meters usage

A 90-foot vertical antenna constructed from **aluminum irrigation tubing** is detailed, focusing on its innovative raising and lowering mechanism. The resource describes a **45-foot ginpole** system, allowing a single operator to erect or lower the antenna in minutes. It covers the mechanical design, including the pivot base, insulated joints for the tubing sections, and guy wire attachment points. The antenna consists of two 30-foot sections of 4-inch tubing and one 30-foot section of 2-inch tubing, stacked with the smaller diameter at the top. The electrical design incorporates PVC "condulet" boxes at the 30-foot and 60-foot points, housing relays to change the effective height for multi-band operation on 160, 80, 40, and 30 meters. Ferrite rod inductive chokes are used for DC control and to tune out gap capacitance. The antenna is fed with 1000 feet of open wire line, connected to a matching transformer comprising stacked toroids and a coaxial/toroidal balun. Grounding is achieved with a 3x3 foot grid of 16-gauge tinned copper wires with soldered crossovers.

A simple vertical antenna for 70 cm band

A pdf file with review of RTTY contests software available on the net and information on how to operate a RTTY Contest, by RSGB.

A vertical antenna project than can present low swr from 40 to 10 meters by using a balun in french

A magnetic loop antenna calculator made with an excel sheet that run also with open office, let you design mag loop antenna dimensions by AA5TB

Build your own multi-band mobile ham antenna with a Hamstick

How to calculate "phasing line" lengths that actually work.

A universal LF/MF preamplifier by Lyle Koehler, K0LR

This resource details the conversion of an 80m elevated vertical antenna to include 160m operation, focusing on a relay-switched design over a trap-based approach. It presents specific feedpoint impedance values, such as **32 ohms** for 80m and **14 ohms** for 160m, and discusses the challenges of SWR drift encountered with the prior trap system during RTTY contesting. The article thoroughly explains the design choices for elevated radials, referencing _N6LF QEX data_ to debunk common myths regarding radial length and height, demonstrating that non-resonant radials can offer superior current uniformity. The construction section provides practical insights into building the vertical, including guying strategies, material selection from scrap pipe, and weatherproofing the relay assembly. It highlights the use of a common mode choke for the relay switching line, measuring approximately 5K ohms on both 160m and 80m, and details the L/C matching network's role in achieving a 50-ohm match at the end of a 300-foot RG-11 run. The author describes a precise VNA-based radial trimming procedure, achieving resonant values within a 3 KHz range. The content emphasizes the practical application of theoretical antenna principles, particularly concerning the interaction between the vertical element, cap hats, and the matching network. It offers a candid assessment of component selection, such as using junkbox parts and acknowledging the need for future upgrades to static drain resistors. The article serves as a comprehensive case study for advanced antenna builders tackling multi-band vertical designs.

Excellent poster representing the electromagnetic spectrum from 31.2 mHz to 6.52 EHz, PDF file poster designed by Anthony Tekatch

Remotely controlled antenna switch that can switch between 5 antennas

Excel spreadsheet that help calculating dimensions of a high efficiency magnetic loop antenna for HF bands. Giving in input the loop perimeter, loop diameter and loop conductor will calculate electric characteristics, bandwidth, and efficiency

This magnetic loop is 78cm diameter, with the smaller Hertz loop for tuning. Feeding is by gamma match.

A 2,4 GHz 13cm band quadrible qiad antenna with reflector offering a 14dbd gain

Antenne Cadre Project by F5NGZ, description by F5TZA in french

A simple quarter-wave length vertical for 40m band using a 12 m spiderpole

This vertical antenna consist of a 18 meters telescopic pole and allow operations from 160 to 30 meters band, project by Daniel Zimmerman N3OX

This receive only loop covers a frequency range of about 5 MHz to 22 MHz and is built from readily available parts.

This article describes a loop usable from 7 - 21 mHz, using half inch copper tube 3 feet in circumference