Until you try in your attic, you won't know if your attic is 'good', 'bad' or "horrible". If the larger HD7698P will fit, use it. The few dB of additional gain provided by an antenna is much more valuable than gain offered by any amplifier. Don't be in a hurry to buy an amplifier, at UHF frequencies, 20 feet of coax will only have about 1 dB of loss, any amplifier will add more noise than that. Only if your tuner has a high (bad) noise figure would a quality low noise amplifier help.
Look at the "dB gain over reference dipole" to compare the difference in performance of the antennas you are considering. Winegard is one of the last antenna manufacturers to publish this data... (sad that the others are choosing to hide the information.)
http://www.winegard.com/kbase/upload/HD7694P.pdf
http://www.winegard.com/kbase/upload/HD7697P.pdf
http://www.winegard.com/kbase/upload/HD7698P.pdf
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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Last edited by GroundUrMast; 8-Nov-2011 at 2:38 AM.
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