Beverage antennas provide one of the least expensive and most reliable ways to improve DX capabilities on the low frequencies.
Assembled
This one coax output beverage antenna has got internal relay for direction switching.
Common mode choke coils work as a simple wire against differential mode current (signal), while they work as an inductor against common mode current (noise).
This is two port antenna switch - middle box between pair of Bi-Directional antennas with single coax output.
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