Modifying the antenna length, either way, will most probably decrease your range. Some receivers are more tolerant of this than others. for instance, FMA M5 will not change tuning but will loose range with a shortened antenna but many electric park flyers use the M5 becuase of it's high tolerance to shortening the antenna. Even the commercial shortened antenna will reduce the range but; we are furtunate in that most of the better receivers still have adequate range with the commercial shortened antena. Check out some of RCCam's experiments on changing antenna lengths for good info on the true facts on effects of changing antenna lengths. His experiments were done using good test equipment by someone who knows what he is doing.