I wasn't aware that Orion sold Channel Master products. Interesting. Also interesting that you've managed to capture 10.1 (CFPL London, CTV2, RF10) with an indoor UHF antenna. It's about the furthest receivable VHF station from here. Good stuff.
Yes, a rooftop installation is definitely recommended. If it's within your budget, a rotator is also recommended to tweak signals.
DMX 68' tower, HyGain HAM 5 rotator, Antennas Direct DB8e & C5, Channel Master 7777 preamp, Siemens surge protection. TiVo Roamio DVR