-
Feed Lines - ARRL
Coaxial cable commonly used for Amateur Radio has an impedance of 50 ohms while ladder line impedances can vary from 300 to 600 ohms. Amateur Radio transceivers ... Learn More
-
Antenna Modeling for Beginners - ARRL
The following material supports the book "Antenna Modeling for Beginners". It contains supplementary information including references and tutorials. Learn More
-
Verticals - ARRL
The American Radio Relay League (ARRL) is the national association for amateur radio, connecting hams around the U.S. with news, information and resources. Learn More
-
EFHW Antenna 80m Extension Kit - ARRL
The American Radio Relay League (ARRL) is the national association for amateur radio, connecting hams around the U.S. with news, information and resources. Learn More
-
Grounding - ARRL
After antennas, station grounding is probably the most discussed subject in amateur radio and it is also the one replete with the most misconceptions. Learn More
-
HF Wire - ARRL
The American Radio Relay League (ARRL) is the national association for amateur radio, connecting hams around the U.S. with news, information and resources. Learn More
-
Limited Space and Indoor Antennas - ARRL
A "full-size" antenna, such as a half-wave dipole, has a number of advantages, but smaller antennas can work very well, too. If you live in an apartment or ... Learn More
-
FCC RF-Exposure Regulations -- the Station Evaluation - ARRL
The American Radio Relay League (ARRL) is the national association for amateur radio, connecting hams around the U.S. with news, information and resources. Learn More
-
Diamond Antenna: Home
Welcome to the new and improved diamondantenna.net! With an updated look, new search system, new product listings, and more, we hope to deliver the best ... Learn More
-
Colorado Governor Signs Amateur Radio Antenna Bill Into Law
Mar 16, 2015 ... Friday the 13th turned out to be a lucky day for Colorado hams, as Gov John Hickenlooper signed into law an Amateur Radio antenna bill that ... Learn More
NEW TO ARRL
LEARN MORE ABOUT
MEMBER QUICK LINKS
LICENSING LINKS
IN THE ARRL STORE
Copyright © 2026 The American Radio Relay League, Inc. All rights reserved. Reproduction of material from any ARRL web page without written permission is strictly prohibited.