Discord
I had forgotten aboutt he TV phenomenum.
Where I lived, Stanwell, we were not far from the extended centre line of 23R . With strong south westerlies a common occurrence that runway was used a lot especially in winter and as you say as the aircraft taking off approached the TV would start to flicker , that would increase until it started to fade gain.
I was told it was a sort of radar effect with the TV signals being reflected by the props . I dont recall that many jets used 23R and cannot remeebr noticing any difference , they were probably a lot higher passing my road than DC7s and the like. Although out delivering papers one Sunday morning around 7am a sadistic Pan am skipper decided he would awake the snoozing populace with a full power take off on 23R in the period when it wasnt used much but was still available for use
PB