Anyone who still believes that RFI does not affect electronic systems, please take a look at this:
http://www.cherryclough.com/Download...20Oct%2005.doc
(Word doc format)
Whilst most of the examples given are not directly aircraft related, it clearly demonstrates the wide range of effects RFI can have on an electronic system.
Some sort of high powered transmitter, operated near an aircraft *could* adversely affect avionic systems.
(Note that I said "could" and not "will", "would" or anything similar)