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Here is the video I was talking about regarding static. Watch close at about 1:20 minutes into the video.

 

Sirio Gain Master vs Antron 99 - YouTube

 

I can't be sure, but maybe this shows us how static can affect both TX/RX. You can actually hear the static on FM transmit in this video, and you can see the effect of the static even when the squelch is set to quieten the radio. I can't explain why only one of the stations of the three tested...produces the noise we hear excepting it was the weakest signal and maybe was farther away.

 

This is not the same thing I was talking about, but it does show how static or ambient noise can also affect transmit.

 

Also note the FM dead key for each antenna. The GM is just above 1 on his meter, and the A99 is above 4 when they are not talking. They key and talk pretty fast, so you have to watch carefully.