You can still get pretty far with an RTL-SDR attached to them, which can be had for $25. I have successfully debugged radiated EMI issues with the combination o

You can still get pretty far with an RTL-SDR attached to them, which can be had for $25. I have successfully debugged radiated EMI issues with the combination of these two: https://www.amazon.com/seeed-Studio-RF-Explorer-Antenna/dp/B077K2J8H2/ref=sr_1_2?keywords=near+field+antenna+kit&qid=1574714557&sr=8-2 https://www.amazon.com/seeed-Studio-RF-Explorer-Antenna/dp/B... https://www.amazon.com/RTL-SDR-Blog-RTL2832U-Software-Defined/dp/B0129EBDS2/ref=sr_1_4?keywords=rtl-sdr&qid=1574714580&sr=8-4 https://www.amazon.com/RTL-SDR-Blog-RTL2832U-Software-Define...