Do not contact moto, they would never sell anything that might compromise the radio. You did not say what you were trying to do.... So I shotgunned the answer. 7" antenna will improve the range about 5 percent. There used to be a universal cell phone antenna, and it worked. To my knowledge, no one makes what you want but it should be easy enough. A weird thing to try would be to tape a portable VHF antenna to the existing antenna. Tape along the whole shaft, not the tip. Again, the radiation will passively go into the VHF antenna and the extra copper in the VHF antenna will increase the range a little.do not buy a metal telescoping antenna, a rubber sucky works better.
Contact Technical Support
Mark
Motorola Support
It is not the length of the aerial that matters but how it is wound there are books that explain the function of aerials and the relationship between windings and wave length or cycle so by studying the books and having a fibreglass fishing rod you can in effect may your own aerial to what ever length you like
next thing you can do is join a club for radio operators ( ham or otherwise) and you will be in an organization that will help you to get the best from your radio
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I used this antenna, from ebay. It's twice the length. I bought a pair of these:
UHF Antenna for Motorola HT1000 MTS2000 MTX8000 095A206 views
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