I'm trying out a USB TV thingy, and a portable TV aerial. The communal aerial is rubbish, and won't pick up any digital TV channels, and the analogue ones aren't great quality. The portable aerial picks up a fair number of digital channels (37), and the quality is pretty good, but...
The signal goes all funny sometimes, when cars are passing, or parking up outside. Really annoying when a car pulls up, and the engine is still running as passengers pop into the shops. Scooters seem to cause the same problem. Not all cars do this though, I've noticed.
What causes this? Something to do with the electrical field radiation from the alternator perhaps?
Any ideas? Any solutions? Are powered aerials better?
(Don't get me started on the communal aerial. The local HA are supposed to be sorting it out, but are fecking useless. In fairness it's not a necessity)