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Nerobro said:the rubber duckies that I used for my HT1000 were claimed to be a dipole. (hey, I really don't know, it's what motorolla claimed) But I think it was an 1/8wave. I'd assume you can get something simmilar for CB.
Leave it to Mot to make a claim like that. (Grin) Most rubber duckies in commercial service are 1/4 wavelength whips coiled into a short space. They need a counterpoise of some sort (radials, car roof, or your arm) to come close to being able to radiate. In that case, they behave like a 1/2 wave dipole antenna.
Actually, for Nick's application one of those foot-long rubber ducks that come with the "emergency" CBs would probably work. I wouldn't recommend the magnet mount - it should be bolted on, just so it won't blow off and knock down half the ride group.
I've seen ads for so-called 1/2 wavelength antennas for handheld radios, but they'd need some sort of a matching circuit either built-in or in a separate box at the base. But they've all been for VHF use, not CB.
Dave
P.S. Nick, sorry for the information overload. Debating antennas is ham radio's version of the chain/shaft discussion. D.