Post by highmountainradio on Jan 11, 2018 17:22:22 GMT -6
Greetings To All !
Here is a very handy idea for those who may be in need of a good omnidirectional FM broadcast antenna. You may be able to locate an old CB radio Ground Plane antenna for very cheap that you can cut down to the appropriate size for your broadcasting frequency. For 1/4 wave Ground Plane 1/4 wavelength formula is 468/frequency in Mhz. Divide the result in half. That is your radiator (main vertical element) dimension. Add 3 or 4 radials downward sloped at a 45 degree angle, you may prune these to the same size as the main radiating element.
If the elements are made from hollow aluminum tubing and you want to mount it OUTSIDE (best place) and you don't want to 'advertise' what it is really being used for (covert), simply add additional length to each element, make them all the same length for a uniform appearance and add the extra lengths of PLASTIC RODS to each of the 3 or 4 radials and one to the main vertical radiating element and make the antenna APPEAR to be for a much lower frequency, such as a standard scanner antenna for the low VHF spectrum. In fact the antenna won't be affected in performance by the additional plastic rod extensions and consequently won't draw any unneeded scrutiny !
It works fabulous ! Hope this spawns some good ideas for others out there !