What is the aerial cable and where does it run. I had been told that the cheap 'n cheerful co-ax wasn't much good for digital TV.
Didn't believe it until I witnessed the difference replacing it with good quality coax with copper braid AND a foil screen.
Amplifiers need to be as close to the aerial as possible, not close to the set. Digital TV is broadcast at 1/10th the power of analogue, so any noise coming in is bigger in proportion. If you're picking up spikes in the cable, it makes sense to have the cable carrying the output of the amplifier as this is bigger.
f the aerial or aerial lead is near the boiler or it's wiring, see if you can separate them further apart.
John
March 2008