Diamond SRH320A Triband HT Antenna
All of the review for my Kenwood TH-D74A said to buy a better rubber duck than the one which comes with it. I read a lot of recommendations for this antenna. It works noticeably better than the standard antenna. It does have a longer length, but it still fits in my backpack.
Check out the Diamond SRH320A Triband HT Antenna!