I am replacing my 121 AK ELT with an ACK E04 406 ELT. The current installation has a horizontally mounted antenna buried in the horizontal stab fairing. I have two problems. One, the current antenna is designed for 121. Two, it's almost impossible to replace the current antenna with the one supplied with the new ELT without kidnapping a small child to climb down the fuselage to disconnect the BNC and put a wrench to the old antenna mount. Considering that the old 121 antenna is sub-optimally mounted horizontally, should I just reuse the current antenna? The new 406 ELTs broadcast a homing signal on 121 in addition to the 406 signal encoded with GPS data, so the current antenna theoretically should work for the homing signal. But is the antenna hopelessly out-of-band for the 406 signal? Maybe I should cut the old antenna to perform on the 406 frequency at the expense of the homing signal?