Mini Loop Antenna 9 9KHz to 181MHz HF & VHF bands, Overview by Technology Master 

Thanks for appreciation, it helps keep me making more videos. Radio, scanner or receivers are the same for analogue as well as encrypted signals. We need to be sure that 1-our receiver/scanner is able to receive frequency of interest. 2-should have ample bandwidth to receive whole signal e.g an am radio with 500khz (don't remember exact) will not be able to receive FM radio signal as FM broadcast has 10MHz or more bandwidth. 3-receiver should have the capability to receive modulation type of the signal. Some modulation types are AM, FM, SSB etc. Some of the hardware that can be used for most signals include RTL-SDR, Hackrf-one, AirSpy R2 etc. Here is a list en.wikipedia.org/wiki/List_of_software-defined_radios