I just bought some rc305 receivers to built a diversity ground station and did some range testing with a friend of mine who also has a two year old rc305.
Strangely all of my receivers (5 in total) are worse than his old receiver.
He could fly 4km with a 400mW TX and a 8turn helical on the ground station with clear picture, when my picture was almost gone.
We also switched the antennas from my ground station to his and my receivers were still worse.
There were also differences between my receivers.
Did anybody else notice such differences in quality?