Its before breakfast for me now, but you could set up a transmitter on a
ISM frequency at 5 GHz or 60 GHz, where you have plenty of bandwidth
(where plenty means 160 MHz or 2 GHz) and transmit your own clock signal.
Either you roll your own by modifying some ham radio open source
designs, or try to find some cheap surplus.
(A Filter followed by a logarithmic detector might be sufficient for the
receiver if you settle for Amplitude shift keying, a oscillator with a
amplifier that you switch on during your clock pulse might be sufficient
for the transmitter.
Greetings,
Hendrik
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