Do the HD-2 signals travel as far the main signal? I had read somewhere on this board that an effective coverage area might be 30 miles from the stick. What are you observing with your radio?
HD signals do not usually travel as far as the main signal. How well it actually does depends on the station, your equipment, your location, etc. I've heard of a few people getting FM HD signals farther out than a lot of people can get the analog signals, but they have invested pretty heavily in good equipment, and their results vary widely. Most of them also live in relatively rural or micropolitan areas and in class C territory. AM HD signals, which can't do HD-2, tend to do rather poorly and can presently only broadcast in daytime hours. The HD stream of the main signal will fall back on the analog signal (if available) when you get out of range. If there's an HD-2, it's not, however, afforded that luxury.