On 11/17/2021 1:39 PM, David Winarsky wrote: > when I installed all 10 of them in my shack, there is 6-10db of noise to my antenna less than 50 ft away (and 70 ft up). 10 of the same uncorrelated noise sources is 10 dB stronger than one of them alone -- it's 10X log of the power ratio, and the log of 10 is 1. 73, Jim K9YC