All aircraft radios use 50 ohm cable. Be sure to use RG58 FOAM. The foam coax has about 1/4 the loss of the regular RG58. You can buy it at any two-way communications shop or in the internet. The Radio Shack stuff may cost 20% less, but it is almost as bad as hooking up the antenna using the zip cord used on table lamps.
Jim Vance
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