Thanks for updating your TVFR link. The signal levels are too weak for me to think you would get much from an attic install.
The C2V is a very good antenna in strong and moderate signal conditions. It may not be enough antenna even if you mount outdoors, clear of all obstructions.
Your TVFR suggests that even the Antennas Direct 91GX and an Antennacraft Y10713 would not be over-kill. I would join the two antennas with an
Antenna's Direct EU385CF UHF/VHF Antenna Combiner and then follow that with an
Antennas Direct PA-18 preamplifier.