If you prefer to just buy a commercially made antenna here are a some brands available; along with some duplexers/triplexers. Remember, however, these are for light duty therefore, will not be appropriate for major mountain winter sites.

Dual band, buy Diamond.

Tri band, by Comet.

And for a mobile 3-band antenna there's the Comet's SB224, be sure to order the NMO type for a good mount

Comet's base station antennas To buy.
Retail storeNear Portland, to buy.

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