This was one of my favourites the voice of vrillion, you do wonder how it was done, suspected it was someone nearby, interuption of the audio carrier, sounds like they had to inject something into it, video was unaffected.

Back on analog days, link from main transmitter in bigger city to the second transmitter was always somewhere on UHF band, sometimes even just a regular relay from main transmitters signal.

Someone just needed simple analog tv rig, nice amplifier and long yagi setup on a hill or a rooftop near secondary transmitter, but at the direction of main transmitter. Turn rig and amp on, maybe "beep the receiver" and ask your friend at home did you get over that transmitter, if yes, just trow your own show from VHS casette.

Back in the day, they did just turn tv transmitters off for night time here. Someone maybe had an scanner an tape deck on a hill, listening audio carrier and waiting digital beep, that turns transmitter on at morning. When you did get it to the casette, you had the keys to turn that secondary transmitter on. Thats the "beep the receiver". Diffrent beep was used to turn transmitter off.

Remember, on cases like this, aluminium on antenna has cheapergain than amplifier