Place the antenna in front of an east-facing window. If you don't have an east-facing window, you are completely at the mercy of the building's materials and its surroundings.
If hitting, touching, or moving the coax causes a reception glitch, it would be my observation that the cable is defective or intermittent. It's length shouldn't be important with signals that strong unless, as suggested initially, your apartment's location is compromised.
I'm curious as to which version of the C2V you have and where it was purchased. There are three possible versions: Version 1 had a a single connector on the back of the loop and an external combiner attached to the lower, inside of the reflector. Version 2 has two connectors built into the back of the loop and no external combiner. Version 3 has a single connector on the back of the loop and has a VHF component with two connectors that clips onto the wire reflector. Version 3 will also free-stand on a flat surface without using a mount or stand.
Best of luck!
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