The free, open-source encyclopedia of amateur radio. Whether you're just getting curious about the hobby or you've been on the air for decades, you'll find something useful here.
Amateur radio (also known as ham radio) is a hobby and service that brings people, electronics, and communication together. Licensed operators use radio equipment to communicate with others around the world, experiment with antenna and radio technology, provide emergency communications, and much more.
This wiki is open source and community-driven. Every page can be improved. Learn how to contribute.
New to amateur radio? Start here.
Licensing systems vary by country. Find the information relevant to your location.
Learn how to get on the air and make contacts.
From FT8 to DMR — digital modes are transforming amateur radio.
Everything about the gear you need.
The antenna is the most important part of your station.
Understanding how radio waves travel is key to making contacts.
The science behind the radio.
Amateur radio saves lives when other systems fail.
Operating through amateur radio satellites and beyond.
The competitive side of amateur radio.
Track your progress and earn recognition.
Software that makes amateur radio better.
Build it yourself — a proud amateur radio tradition.
The story of amateur radio.
Connect with the amateur radio community.