Interesting article and comments

[mr_fixer]

During my brief research, I've found others who say that it was a scam to frighten people into paying the license fees. But all superheterodyne receivers use a local oscillator in part of the circuit design which has been used to detect radio receiving sets during WW2 namely submarines to find Merchant Marine convoys. Scott Radio Labs developed the SLRM and the RBO Radios with special shielding to prevent the Local oscillator from leaking out of the cabinet. and won several awards for it. Logan