[Julesomega]

Bit more nit-picking: two very different mechanisams involved
'Transmitters' got into the sound by cross-modulation of the front end and I expect would be clean audio and present only when tuned to a local TV signal (and probably would modulate the video as well)
6MHz 'Senders' get there by leaking into the inter-carrier (FM) sound IF and would be clipped and distorted. The latter is only possible with a Dual Standard set