Radio antenna

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The Radio Antenna Book (Engineering Staff of Radio) 1936

It surprises some people to learn that, though cell phones offer inexpensive, instantaneous communication worldwide, there are still millions of active ham radio operators around the world. We like to say that there is something for everyone in our h...

In this Video I deploy the Chameleon Antenna Systems LEFS 8010 Endfed antennaI verify the SWR readings for the bands I like to operate on.and set this antenn...

Urban Rooftop Ham Radio Antenna: I recently put a ham radio antenna on my roof, so I could get better signal inside my apartment, which isn't on a high floor. As an ultra beginner without a lot of investment in the hobby, it was perfectly acceptable to have to climb onto the roof …

The militia-patriot movement in America has embraced radio communications in a big way. Within the past decade, the methods and communications gear have evolved from basic CB or FRS radios, to now …

The delta loop antenna, like the Greek uppercase letter “delta” (∆) from which it draws its name, is triangle-shaped (Fig. 14-8). The delta loop is a full wavelength, with elements approximately 2 percent longer than the natural wavelength (like the quad). The actual length will be a function of the proximity and nature of the underlying ground, so some experimentation is necessary. The approximate preadjustment lengths of the sides are found from: The delta loop antenna is fed from 52-Ω…

I'm trying to build a 1/2 wave "Coaxial J-Pole" antenna, similar to what is described here: Such an antenna would be great for stringing up in a tree when operating remotely, no tuner needed. The...