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Looking at the Winegard HD7694P you mentioned, it has an estimated range of 35 miles on the VHF band and 25 miles on the UHF band. According to my tvfool report I am 55-56 miles away from the broadcast towers. Does distance of an antenna matter?
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I don't pay much attention to the mileage figures. They are a creation of the marketing department, rather than engineering. I go by the strength of the signals and the Noise Margin on your tvfool report. You are certainly welcome to try the larger HD7697 in your apartment. It has a little more gain than the 7694, but it is a lot bigger, and costs twice as much.
HD7694 specs:
•Boom Length: 65"
VHF gain (CH7-13) 8.3 to 9.9 dBd
UHF gain (CH 14-51) 10.4 to 11.5 dBd
HD7697 specs:
•Boom Length: 131.25"
VHF gain (CH 7-13) 10.8 to 12 dBd
UHF gain (CH 14-51) 11.8 to 14.6 dBd
C2V specs:
VHF gain (CH 7-13) 2 to 3 dBi (0 to 1 dBd)
UHF gain (CH 14-51) 10 dBi (8 dBd) average
https://www.antennasdirect.com/cmss_...cSheet_C2_.pdf
https://www.antennasdirect.com/cmss_...heet_C2V_f.pdf
Even without a preamp the 7694 is a little better than the C2V on UHF, and a lot better on VHF, which you need. I'm not comparing mileage, I'm comparing performance.
Interpreting Noise Margin in the TV Fool Report
http://www.aa6g.org/DTV/Reception/tvfool_nm.html
You can add the antenna gain and the preamp gain to the NM figure in the report to improve it, but you must subtract the Noise Figure (NF) of the preamp because it adds its own noise that degrades the SNR (Signal to Noise Ratio) of your weak signals.
The C2V with a preamp would make a smaller package for indoors. The preamps to consider are the Antennas Direct Juice and the RCA TVPRAMP1R. The Juice is very tolerant of overload, but it doesn't have an FM filter. The RCA has an FM filter, is less expensive, but sometimes has quality control problems.
If you are trying for CH 6, some FM filters will mess it up, and some will protect it. See Attachment 2.
Disclaimer: I can't guarantee that this will work. My advice is based on my 73 years of antenna experience, your tvfool report, which is only a computer simulation, and what you have told us.