Would not Receiver to wire, wire to re-transmitter, re-transmitter to re-transmitter, to receiver to wire..........solve most of the detection problems...... It doesn't make it uncomplicated.
Also if you are using Omni directional burst transmissions along with frequency hopping ........like SINCGARS....... detection is near impossible and the direction of the intended receiver is unknown too.
SINCGARS transmits over a range of one to 1500 channels.. You can use one channel for instance to do direct with a civil authority. Normal operation is in frequency hopping mode. You upload the "Key" that tells the microprocessor in the SINCGARS radio which frequencies are true and for how long. Most are transmitted on for nanoseconds individually, thus you need to know precisely which frequencies and duration or you get nothing... It all sounds like solar static and bleed off from everything else transmitting radio noise.
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