faa report
The FAA looked at this in 1999 and reasoned that a transport category very rarely came close to exceeding the certification limits whilst operating near a typical American city. This doesn't answer you're question exactly but I would not want to be the guinea pig testing any theory that everything will be done if you fly in front of Fylingdales. Imagine flying towards it and your shiny new Full Authority Digital Engine control goes haywire in sync to the transmission modulation. I might be wrong but I don't think anyone had yet been knocked out of the sky by a HIRTA. But I bet some odd occurences have been so caused (mag plugs in a gearbox with no chips found?)