In a few areas in the UK there are antenna farms with towers up to 1000' agl. I remember one near the south coast, west of Bournemouth, if anyone wants to fact check me.
The facilities are of course marked on charts. You have to take your headphones off in the vicinity, in case arcing occurs between the ear pieces due to the intense RF field.*
Well, they do teach newbies that scud running is very dangerous. Perhaps the advice is true!
* I popped that one in for you YR RIGHT. It's fun making stuff up - I might do more of it!