Two antennas - one feeder?

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Is it possible/practical to feed 2 antennas (ie. VHF and UHF) with one common feeder?  If so, what are the disadvantages?

Jonathan, London.

Yes... you will need a diplexer at the antenna to separate the UHF from the VHF, and you will need one on the radio end (if you're using two radios, or a radio with split outputs). The disadvantage is some loss in the diplexer. For FM repeater work, it's likely of no concern. For very weak signal work, it's not the best approach.

TV antenna manufacturers have been doing this for decades.

VHF and UHF elements on the same boom with one feedpoint.

If you don't plan to use both bands at the same time, then yes, it's done all the time, HF and VHF/UHF.  There are quite a few 'dual band' antennas which do the same thing, two antennas, one feed point.
If you are talking about using the same feed line for two different antennas/bands at the same time, then start looking at duplexers/diplexers.

Guy "Vern" Wells:
You could just build a simple SO239 ground plane antenna with two radiators in a V pattern for $5.00 worth of parts and wire. One for VHF and one for UHF. Make the four ground radials VHF length. You can find drawings and the correct lengths online.
By the way; that's duplexer, not diplexer. Excuse my American ham friends for murdering the King's English.   


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