Can I put a ham radio antenna in my attic?
Attic mounted antennas will work just fine and you will receive pretty close to the same results as you would if the antenna was outdoors. Most roofs have asphalt shingles on them, which won’t appreciably block RF radiation.
Do you need to ground a J pole?
J-Pole antennas are half wave antennas by design. Actually they are a half wave antenna sitting on top of a quarter wave matching section. But instead of an RF ground, the antenna should have an electrical ground to protect it in case of a lightning strike.
Are J pole antennas directional?
The J-pole antenna, more properly known as the J antenna, is a vertical omnidirectional transmitting antenna used in the shortwave frequency bands.
How does a Slim Jim antenna work?
SLIM JIM ANTENNA PROJECT. The Slim Jim is a vertically polarized omnidirectional end-fed antenna having considerable “gain” and this is concentrated almost parallel to ground toward the horizon rather than skyward making it more efficient than a ground plane type antenna by about 50 percent better.
Are attic antennas safe?
Attic antennas are protected from the elements, which makes for a safer installation and better longevity. They also make use of wasted attic space. Antennas offer a variety of mounting options. They can be placed on the attic floor or installed on the ceiling or a wall.
Are J-pole antennas directional?
Does a Slim Jim antenna need to be grounded?
The antenna does not need a ground to work, since it is a half-wave design. For lightning safety, the best thing would probably be to mount a lightning arrestor on a metal plate mounted on a ground rod, and run the coax through the arrestor.
How much does A J pole antenna cost?
This is an excellent performing J-Pole type antenna, constructed from readily available materials. Approximate cost: $35 (not including coax or tools.) Perhaps the most difficult item to locate for this project is the 3/8″-24 threaded rod.
How tall does an antenna need to be in the attic?
If your house has a tin or steel roof, then the attic wouldn’t be much of an option. The only concern with attic mounted antennas is the space available to you for mounting. The KB9VBR 2 meter J-Pole antenna is 69 inches tall overall. You will need a peak in your attic that is tall enough for the antenna to fit.
How big is a 300 ohm twinlead antenna?
300 ohm twinlead Figure 1The dimensions of the original 2 meter 300 ohm ribbon J-Pole for insertion into ¾ inch 200 psi pvc pipe. Splice and short together Short topside of RG174a RG174a coax 15 1/4” 1 1/4” 11 1/4” 300 ohm twinlead
Is there a tri band antenna for 2 meters?
A Tri Band Antenna for 2 meters, 220 MHz, and 70cm Antenna Without Radials By: Edison Fong (WB6IQN) US patent –9,608,336 QST March 2017 Previous Antennas