I ordered the DB4e, and ran the cable to the attic in advance. For grins, I put the dipole rabbit ears from a portable set on the end of the RG6, and got all the stations, though 51.1 was only around 75% or so. The others UHF stations were in the low 90's or better, and the two VHF were both at 100%.
So for grins I switched it out with a little bowtie I had that was designed to clip onto rabbit ears. 51.1 came in at 90+%, and all the other UHF were at 100%. VHF was never less than 90%.
Today I got the DB4e, mounted it, scanned, and got 100% on every station, plus 49.x which I couldn't get at all before, but the signal never went above about 55%, and it was unwatchable. Moving it around a number of times, the best it got was sitting on the floor joists, but that negatively affected the stations I wanted, so it's hanging off a pole now.
Next step is to move it outside. If I can get that weak station (sort of) inside that attic space, I may stand a real chance of getting it and it's 4 or 5 subchannels when it's outside. 51.1 may be behind the scrubby tree if I mount it on the gable end on a j-pole, but it's worth a try. Maybe next spring.
Thanks all for the help. The DB4e was a good choice, even with the two VHF stations (which are close, and strong).
