They sell them also at boating supply stores. Or look online at West
Marine or sailnet.com.


Rafael Fraga said:
> snip
>> I once looked round the control tower of my local airport, and they
>> had a device which recieved the local comms channel, and had a crt
>> which
> "pointed"
>> in the direction of the incomming signal so the controllers could see
> where
>> the aircraft was who was talking to them. It had an array of 4 dipoles
>> on the roof of the control tower. Also look up "RF direction finding"
>>
>> Cheers.... Mike.

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