Those loss charts really support the idea of good quality cable with the antenna closer to the transmitter.
I think we agree but I'm a little confused because it depends on whether you refer to an IEM system or a microphone system.
It's safe to say that it's best to cover as much of the distance between TX and RX as you can with modern low loss cable and as little free space between them as possible.
Before someone pipes in about RF overload, IMHO that issue is far less likey to cause real world trouble than insufficient RX signal strength, especially if you place antennas in a way that prevents TX and RX from getting within 10 feet of each other.
edit: OK, so not strictly as close as possible.
More like minimal while maintaining even performance area coverage.
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