its designed by me at 2020. its working so well. range is nearly 150m. it works between 88-108 mhz.
you can check link below
https://www.trendteknik.net/showthread.php?tid=296
oscillator 2x 2sc9018
diode: bb105 varicap
1micro f : microphone
30pf capasitor: variable tuner
42nh coil:
4 turn.
loop diameter 3mm.
wire diameter 0.8mm
