I have a cheapo GOOIT Gy560 off ebay, I think it was around $20 including shipping. Its 50MHz-2.5GHz.
its simple, takes a 9 volt. Little 2 inch telescopic antenna. Of course you can only receive within a few inches from the transmitter
Only 1 button to operate the device, 100Hz, 200KHz, 1KHz step. Simple but it works! Its great to find out what frequency a portable is programmed.
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