I've run the d104-m6b in a big truck and found in the best noise conditions with that mic turned almost off it still would pickup too much background noise but I did find that most people I asked over the air prefered the turner rk-56 over the astatic 636-l and who are you trying to please anyway? right the other guy because he's the one who has to listen to your big engine roar. :laugh:Ok I was just wondering I have a 636 and love it. Also the stock mic on the stryker gets good reports all the time. I was just seeing if it would work in my big truck or leave as a base mic with your help it will stay on my base