Mileage ratings are pretty much useless when evaluating real world performance. The actual specifications are a much better parameter.
The C2V should work for you outside since the ANT751 tested well for you yesterday. The C2V is not quite as sensitive on VHF, but your weakest channels are UHF. I wouldn't recommend the C2V in the attic since the signals will be weaker & the potential for multipath interference is much higher, especially with VHF.
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