40m end fed vertical

W6RCA's No-Tuner, All-HF-Band - W6RCA's No-Tuner, All-HF-Band, Horizontal, Center-Fed Antenna

Amateur Vertical Antenna Calculator  ^{updated  pop} - This calculator is designed to give the vertical length (height) of a particular antenna, for the frequency and wavelength chosen.

EFHW Vertical Antenna - Steve G0KYA project of and End Fed 1/2 Vertical

Crossed-Wire HF Antenna - This Crossed-Wire Electrically-Steerable HF Antenna, capable of transmitting signals over the entire 1.8 to 30MHz HF range, and capable of receiving signals at much lower frequencies is basically a crossed centre-fed wire system, consisting of four thin wires brought to a central mast by G3YNH

Center-Loaded Off-Center-Fed Dipole - 6 band - Multiband Center-Loaded Off-Center-Fed Dipole (CL-OCFD) antenna that work on 80m 40m 30m 20m 15m 10m by ON4AA

WA7BNM Contest Calendar  ^pop - Complete listing of upcoming ham radio contests, including rule summaries of this week's contests. You can also subscribe to his email service.

SM3CER Contest Calendar Priority listing - Contest Service by SM3CER with Calendar, Rules, and Results

ARRL contest branch - ARRL contest calendar, scores, Forms and rules

Oscar Sierra Bravo Priority listing - The OSCAR SIERRA BRAVO is an International DX Group. We believe in promoting friendship through radio amongst all people in the world. The membership is open to ALL radio operators regardless of their nationality, age, race, religion, politacal beliefs, and their memberships with other clubs.

FCC's Amateur Radio page - Amateur radio Services by the Federal Communications Commission.

Amateur Radio RF Safety Calculator - This is a main beam power density estimation program intended for use as part of a routine evaluation of RF safety compliance with FCC regulations.

Ruzber Antennas - Ham Radio Vertical HF multiband antennas manufacturers based in Spain

GAP Antennas - GAP produces HF vertical antennas

The Ventenna - Rugged, disguised 2m, 220MHz, 440MHz, and 2m/440 dual band antennas, HF portable antennas, portable dipoles.

Titanex  ^pop - Low weight Titanium Verticals, Log-Periodics, Yagi antennas, Quads, towers and antenna accessories by Titanex

Ranger - Manufacturer of the world's most dependable radio communication products

SPACEWARN Bulletin - The SPACEWARN bulletin is intended to serve as an international communication mechanism for the rapid distribution of information on satellites and space probes.

Repeater - Repeater, an independent Dutch ATV magazine

ITU publications - The general Catalogue of Publications contains all current publications,except the Standards currently in force, which can be found in the separate List of ITU-T Recommendations and List of ITU-R Recommendations.

VOA monitoring home page - This page is devoted to all aspects of technical monitoring of radio broadcasts intended for international audiences.

Channel Africa - A uniquely independent, all-African news and information radio broadcasting service.

World Harvest Radio - World Harvest Radio - South Bend, U.S.A.

Spy Centre - All about Spy Numbers Stations, which send coded messages to agents. Includes schedules and frequencies of stations.

Yagi Sterss - A full featured, graphical, user friendly program that performs structural analysis on horizontally polarized yagi antennas constructed from round tubing. YS can work in Imperial or Metric Units, and is likely to tell you more about a yagi antenna than you ever thought you needed to know. YS has been used by commercial manufacturers and premier station builders for over a decade by Kurt Andress, NI6W

40MHz Frequency Counter Module - Design for a very low cost 6-digit frequency counter module using of the shelf components