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Horizontal Half-wave Dipole above a Counterpoise - All antennas that are situated close to the ground are affected by that ground to some extent. This article explain effects and benefits of counterpoise.

Another vertical antenna for 30, 40 and 80 meters - This article is to describe a multi band DX-dedicated antenna offering a minimum of compromises (such as lossy traps), for the hams not having any high-support

SARL Beacon Project on 40 Meters - The beacon project is a South Africa national system of beacons on the 40 meter band operating on a single frequency

DB0GG 10-GHz-Beacon - beacon transmits on 10.368,850 MHz in the 3cm-band

VA3ODX Ten Meter Beacon - 28.263 MHz from Meaford, Ontario

YV Venezuela Callsign Search - Online YV and YY Callsign search.

K7UGA Central Arizona DX Association - The Central Arizona DX Association is an ARRL-affiliated club.

OC1I - SA-076 - Isla Lobos de Afuera - Peru IOTA DXpedition

SOTA South Africa - Summits on the Air South Africa formed in October 2002 to draw up an Association Reference Manual and compile a list of South African summits that can be activated or contacted for SOTA awards

ST2NH's Radio Amateur Blog - ST2NH blog - first ham blog from africa fatures QRP,Homebrew,news,links

N8AHZ Amateur Radio Association of Hanson Hills - ARRL affiliated since 1992

Austin Amateur Radio Club - Austin Area Amateur Radio Club W0AZR is an ARRL affiliated radio club that serves Austin, Minnesota

KC7KEY Maple Valley Amateur Radio Club - The Maple Valley Amateur Radio Club (MVARC), an ARRL Affiliate club, is a group of amateur radio enthusiasts in the greater Maple Valley area who meet and engage in activities to further the advancement of this hobby for the good of ourselves and the community.

N7IG South Kitsap ARC - ARRL affilitated club and a Washington Sate nonprofit corporation.

Latchways - fall protection systems - Latchways are the world leaders in fall protection and the manufacturers of the mansafe range of products for working at height.

Rock-N-Rescue - Rock-n-rescue the source for safety and rescue equipment focused on delivering the best equipment for climbing, water fire and search rescue

Ham Rig on a Bicycle? - A ham cyclist looks at the benefits of combining his two favorite hobbies, ham radio and cycling

Bicycles and Radios - ARRL article on ham radio bicycle mobile operations by Dick Arnold, AF8X

Keplerian Elements - Keplerian elements are the inputs to a standard mathematical model of spacecraft orbits.

P3-D Spacecraft: Overview - Overview of the Phase 3-D satellite project

OSCAR 11 - Designed and built by the University of Surrey's Spacecraft Engineering Research Group - UoSAT in the United Kingdom,

OSCAR-22 - UoSAT-OSCAR-22 is the most recent spacecraft in a series of Amateur Radio communications satellites designed and built by the Department of Electrical Engineering at the University of Surrey in Guildford, Surrey, England.

K3 Meter - Analog S-Meter for the Elecraft K3 for Windows and MacOSX

Lightning Protection for the Amateur Radio Station - Article on lightning protection for the ham radio station, Lightning Characteristics, Identify What is to be Protected, Establishing a Good Ground, Coax Cable Grounding, Operating Safety by wrblock.

Fundamentals of Lightning Protection - National Lightning Safety Institute