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The antenna in the port fin is usually a VOR receiver antenna. Most companies have been sharing one antenna with two VOR's for years. They simply put a splitter in the coax line someplace before reaching the two VORs. You can get by with this because both radios are only receivers. The signal is weaker for each radio than two seperate antennas would provide, but still strong enough drive both receivers at a reasonable distance from the VORs.

Mine has the comm Antennas located on the top of the cabin (Where Herb shows Clecos shaping bases for two antennas). It is pretty rare to see two comm radios sharing one antenna. The transmitter fro one radio has a tendency to burn up the other radio's reciever in that configuration. It can be done, but requires special equipment to isolate one radio from the other. Two antennas are definately cheaper!