We aren't getting any signal on our console from about half of our handheld microphones and we can't figure out what the problem is. We're using a Yamaha LS9 from a booth with diversity antennae mounted on the outside of our booth and we've already checked our antennae and they're fine, our microphones are on the same frequency as their receivers, and the receivers are patched to the mixer properly. We don't know how long this may have been a problem because we haven't used to mics in about a month. Any help is very much appreciated.