Just had a "spectrum engineering officer" from OFCOM (the UK's communications regulator) visit our office investigating alleged interference from our building with a local cell phone tower. After waving an aerial attached to what looked like a portable spectrum analyser around he decided that the HDMI cable feeding a set of four TVs was causing the problem.
This seems extremely unlikely to everyone in our office and we are wondering of their is any validity in his claim. We are a ground floor office in a modern concrete building and the phone tower is on the the opposite side of the street on the top of a multi-story car park (about 4 stories high).
Is it possible for a leaky HDMI to cause such interference?
(He did assure us that we haven't broken any regulations and that no action would be taken.)