Although very inexpensive, that Monoprice Antenna is a poor choice in your location since it 1) provides minimal Forward Gain, 2) is too small to provide significant performance on Hi-VHF (Ch7-13) and 3) may or may NOT have Overload issues due to the built-in Preamp. Although you probably don't have INTERMOD Distortion Overload problems in the UHF Band (requires MULTIPLE strong signals), the built-in Preamp may or may not be causing Overload problems depending on how much attenuation you have in your attic and the SINGLE-CHANNEL Overload characteristics of the Preamp and the attached Tuner.
Ch10 (192-198 MHz) is a fairly weak Hi-VHF station that is on the second harmonic of WRMR-FM (98.7 MHz, 100 kW, only a few miles away) [Who botched up the frequency allocation process so bad to let THAT happen????]. There are several other medium power FM stations near you (see www.tvfool.com
). So Hi-VHF signals should NOT go through a Preamp....you might also need an FM Bandpass Filter if you have reception problems.
W-G HD7698p is an Excellent choice for the preferred OUTDOOR antenna, providing 23 dB Sidelobe Suppression of Ch34 when pointed North. At about 60-deg away from max beam azimuth, HD7698 model indicates a Sidelobe Suppression of 23 dB (difference between -5 dB Forward and -28 dB at 60-deg offset):
Antenna Direct's high accuracy model for 91XG indicates a Sidelobe Suppression of just OVER 23 dB, so it would also be an Excellent choice for a UHF Only Antenna, to be used with a non-amplified, non-rotating, hi-gain VHF Only Antenna, such as Antennacraft Y10-7-13 with a VHF/UHF Combiner (aka UVSJ) . [Or DIY Hi-VHF Hourglass-Loop Antenna mentioned below.]
Use Radio Shack or Antennas Direct VHF/UHF Combiner (aka UVSJ) which have DC PASS on the UHF Port (unlike Pico-Macom & Holland UVSJ which is inexplicably on the Hi-VHF port).:
Hence, since you have no NEED to point Antenna towards Ch34 to receive any other station, a low-gain, high overhead, mast mounted Preamp can be used to improve sensitivity by about 10 dB, depending on your internal losses and the Preamp choice.
If you are interested in exploring your ATTIC location further, on the average there is about 14 dB +/- 7 dB indoor Loss that should provide protection against Overload by Ch34....PLUS Sidelobe Suppression. Channel Master CM4228HD or Antennas-Direct DB-8e 8-Bay Bowtie with a Preamp can be mounted on a rotator if you want to try for stations other than North of you, with a separate NON-Amplified Antennacraft Y10-7-13 for Hi-VHF permanently pointed North and a VHF/UHF Combiner.
If you are so inclined, there are numerous DIY Antennas I've analyzed and provided dimensions for (see 4nec2 Files). For UHF check out the M4 (10x9.5) with Double Angle Reflector and FF4 Free Form 4-Bay with larger Double Angle Reflector. They provide higher Raw (and Net) Gain than CM4228HD....and even usable Hi-VHF Gain that MIGHT make the Y10-7-13 unnecessary:
For Hi-VHF, check out the Hourglass-Loop with a Reflector of your choice:
http://imageevent.com/holl_ands/loops/hivhfhourglassloopEdited by holl_ands - 11/22/13 at 12:25pm