How are you mounting the G2 wirelesses? The inherent nature of the built-in/flexible antennas cause a problem when mounted horizontally. As well they tend to flex and over time stay bent out of shape!
Why? It deals with polarization of the antennas. A bit too complicated to get into here, but you can Google it. Essentially, the wirelesses were designed to be used vertically, that is, the antennas mounted straight up. That's vertical polarization (relative to the ground.) On the transmitter, you would most likely have it clipped to the person's belt or something, again with the antenna vertical? However, with the popularity of camcorders, most of the receiver mounting boxes have the antennas in the horizontal position. Since the antennas themselves are vertically polarized, they are then essentially expecting RF signals from the ground or from the sky. So really all the receiver would receive are RF signals bounced back from the ground.
This antenna positioning is not too critical in an indoor environment where the RF bounces off the walls/ceiling/floor/etc. but as you can imagine outdoors, there's not much to reflect RF, so antenna positioning is very important. Even more so with cheaper units as their receiver may not be as sensitive or reject spurious signals to pick out the right one (the transmitter.)
This is why Lectro offers a variety of antennas including right-angled ones. Those of you who run a 90º BNC elbow on both antennas in the attempt of making them less obtrusive are actually affecting (quite a bit) the range of your wireless system.
You've most likely seen "shark fin" antennas at events, concerts, etc.
... note the VERTICAL reminder!
Yes, there are circular polarized antennas such as helix antennas, but they're not suitable for ENG use due to their size.
For too much info, radio and television transmitters used to be only horizontally polarized. Think about the old exterior TV antenna towers on houses and their Yagi antennas elements positioned horizontally. With the popularity of radios in vehicles "way back when" and their antennas pointing straight up (again, relative to the ground) reception wasn't as good so the stations modified their Tx antennas for vertical polarization to improve in-car reception.