Originally posted by aviators99
I remember somebody on this forum who had a problem with a neon sign at a gas station, I think...
That was me! (But it was the neon lighting on the Park Ave. BBQ restaurant near my house.)
Yes, radio frequency interference (RFI), the stuff that causes black and white sparkles in the picture and static in the sound on analog TV can impair digital TV reception and it manifests itself just as you described, Barry: it can cause freezing and intermitent loss of signal.
Impulse noise from man-made sources of RFI is far more common at VHF frequencies than it is in the UHF spectrum but if the UHF signal is low to begin with, as it would be from your distance, it will be more susceptible to interference.
Another source of strong impulse noise is arcing on high-voltage insulators on powerlines. When we go a long time without rain, dirt builds-up on the insulators and acts as a semiconductor, leading to arcing. When the next good rainfall comes, the dirt gets washed away, the arcing subsides and the interference stops.
If you're keenly interested in receiving West Palm Beach stations from Coral Springs you might consider an antenna rotator or, better yet (and cheaper, too) just adding a second dedicated antenna pointing north with a seperate coax and an A/B switch to switch between the two antennas.