Originally Posted by MarkG
I've got a rooftop antenna with line of sight to the transmitters, with the best HD frequency only, sub 2 dB noise figure, high overload amp i could find. My tuner cards don't report accurately, but they show zero bit error rate and the TV that is also split off the feed shows the high 90s for signal strength. I think the reception is as good as I can get it.
That is the reason why I would recommend to try recording with szap and cat, possibly looking at femon (and see if the problem is reproducible).