You WILL have a problem. And, it ain't worth comparing shingles over. A receive antenna that has been shortened by some action is not optimum for that receiver. Period. The shield is part of the ground system and, like it or not, it is part of the antenna system also.. even on cars. And, it is impedance which could be referred to as 'AC resistance' for simplicithy. Ideally, the receive antenna would be 'cut' for the proper frequency, but that's not practical because many RX's are sold without crystals. So, they are more broadband than transmitters are, thus the reason for sending a transmitter back to a radio specialist (Radio South, Airtronics, Futaba, and so on) for re-tuning.