That word "optimized" is what makes me scratch my head. What does that mean in this context? You'll only get 6db of gain instead of 12db (as rated) when using it on a wireless mic? Obviously, I've already ordered the cell antenna so I'm going to try it out. No DJ gig this week anyway (photo only). If it doesn't produce a noticeable improvement I'll probably send it back, then try Ben's solution. It does seem kinda funny to pay $195 for an antenna when the entire unit was $175. I probably also need to do more testing at the event. Generally, I plug things in, hang the mic over my ear, then walk around the altar area making little "ssh" noises (not full speech). I probably could have un-covered the problem last week and could have made adjustment on the channel being used. The officiant used the hand-held to capture the B&G vows and it was flawless (as usual). Seems the bodypack is the only thing I'm running into issues with.
One more side question. I've noticed the battery level indicator seems to drop pretty fast on the bodypack I'm using. Is it possible that the battery contacts being corroded could be dropping power received from the battery, which could obviously impact the signal being sent out?