Really:
I use a Samson Airline Wireless. It works great for the purpose it serves... Live Gigs! It's totally wireless and uses one AAA battery and it lasts for 14 hours. It utilizes an Audio Technica AH35 (I thinks thats the model number) microphone.
Again, the best thing about it is that there are no wires to bother you. It easily switches from trumpet to flugel and back. It uses a soft rubber clip so it wont damage the finish of your horn. (especially delicate satin lacquer) It works very well up to 150 to 175 feet.
The cost is about $400.
www.zzounds.com They are great to deal with. When I ordered my mic, it was on my doorstep the next morning for $25 extra of course. Hope this helps!!
-Cory-