Thread: Looking for an omni-direction FM Transmitter antenna...
View Single Post
  #5   Report Post  
Old November 19th 03, 07:55 PM
Avery Fineman
 
Posts: n/a
Default
In article ,
(Patrick) writes:

I would like to build the best all around omni-directional antenna,
that would have a good gain, in the FM broadcast band.

Any thoughts would be commended.

FM broadcast is usually horizontally polarized. You can borrow from
the small general aviation "rudder" antenna for the VHF 108-137 MHz
civil aviation band.

That one is two half-wave whips at right angles in the horizontal
plane on the plane's vertical stabilizer. Feed it like a half-wave
dipole. Impedance will be somewhere near 75 Ohms; in aircraft
installations that depends on the vertical stabilizer structure.
Has a fairly good omnidirectional pattern.

It's easy to scale up slightly in size to the FM band. Transmission
levels beyond Part 15 regulations is illegal.

Len Anderson
retired (from regular hours) electronic engineer person
Reply With QuoteReply With Quote