K7MEM
Member
A mobile CB antenna is supposed to use the roof of the car like ground plane, isn't it ?
What happened if I mount it on a grounded (earth) pole with the braid of the coax connected to the pole ?
Is this something someone can use ?
That would probably work to some degree. But you might have a lot of trouble getting a good match (high SWR). The vertical portion of that antenna is only half of an antenna. The ground plane is the other half. The pole, by itself, even though it is grounded, does not provide a sufficient ground plane.
A better idea would be to use an array of wires, laid out on the ground around the feed point. Each radial should be approximately 1/4 wavelength (9') and extend away from the feed point. As it is ground mounted, the lengths do not have to be exact. As a minimum, you should use four wires. Generally, more is better.
I have a multi-band vertical antenna (5BTV) that is mounted at the top of a 18' section of 2" iron pipe. At the feed point, I attached four radials for each band (40, 20, 15, 10 Meters). Because the antenna is elevated, the radials are tuned for each band and angle down at 45 degrees. The antenna has good low angle of radiation and works great. I don't use it on 80 Meters, because a lightening strike made the 80 Meter resonator explode!
Martin - K7MEM