Sorry, I meant for extracting it from the spectrum. I have an RTL-SDR with telescopic antennas and I use software to scan the various bands.
Just remarking on how neatly it hit one band dead centre (undistorted).
My background (from way, way back in 1992) included "Electronic Service Technician" - one year program learning to fix TVs, VCRs and... radios. Never made a living at that mind you... went straight into repairing computers.