As to the 7775 vs. the 3041 DSB - The 3041 is specced at 3 dB gain less and .2 dB noise figure more than the 7775. (High gain and low NF are both good).
The 3041DSB has separate amplifier circuits for VHF and UHF, so for UHF signals you can consider it to be a UHF-only amplifier.
There are VERY few situations where an amplifier can make a signal worse. Of those, the most likely problem you will run into by far is intermodulation. This occurs when the amplifier is overdriven to the point where it becomes nonlinear (and in the worst of cases, starts clipping the signal.) Essentially, if one strong station (For example, WNJB in New Brunswick is running 1.3 megawatts according to www.100000watts.com
on UHF channel 58) drives the amplifier into clipping, then it will ruin reception on ALL channels. In the analog domain, the strong station will appear like a ghost in the background of weaker stations when you tune them. Also, in extreme cases, the strong station will become completely garbled due to the sync signals being clipped. This happened to me when I tried to follow my 3041 with a distribution amp that had too much gain. (I dropped back to the old lower-gain distribution amp and everything became better.)
Before returning the 3041 and ordering the 7775, do a comparison of HOW the signal got worse. Specifically:
a) Is New Brunswick in the same direction as the antenna is pointed? If you're close to NB, even 90 degrees or more off could be problematic.
b) How does reception change on your analogs? Does it appear like another channel is interfering with them? Does the interfering image look like what a known strong station in the area is broadcasting? (For example, if it's early morning and there's a ghost image of Barney interfering with the Today Show on NBC, and when you tune to Ch58, you hear that damn dinosaur's voice crystal clear, then WNJB is overloading your amp.)
c) In the case of Ch58 WNJB, does putting the amp in line cause the set to completely or partially lose sync with the signal?
If you run these tests and it seems to be intermod, return the 3041. Do NOT order a 7775 - It has 3 dB more gain but only 1 dB more output amplitude capability, in an intermod situation it will perform WORSE.
In such a case, I believe Lowes carries a distribution amplifier with 12 dB gain. Not the best preamp, but it will be an improvement over raw antenna and it will be far less likely to get overloaded. Distribution amps are typically designed to have lower gain and higher output capability.
Edit: As far as communications while aligning antennas - FRS radios work great. My family has a huge collection of them that we use for family vacations.