If your transmitter has to be switched on for the buddy box port to work, I suggest that you remove the crystal.

If you leave the crystal in, the transmitting part of the radio is operational, consuming more power. By removing the crystal, the tx oscillator can not run, so the transmiting part will be switched off.

If you leave the crystal in, with arial in, the transmitter is functional, but you will now have a mismatch on the tx output circuit. Remember, the tx circuit was designed to operate with arial extended. This might cause overheating of the final stage transitor, as it has to consume more current to overcome the mismatch. In rare cases, this can cause the transmitter to fail.