Background - UHF - 434-438MHz Two identical crossed Yagi's mounted on rotator.
Currently, I have a low noise preamplifier after combining cables from the two antennas (T connector + matching stub).
I'm considering adding two separate identical low noise preamplifiers right after each antenna(on the antenna boom itself) and combining their outputs later with a T connector.
I am currently calculating link margin for one antenna + preamplifier till the T connector and directly adding 3dB gain after the T connector (in the post-preamplifier feed line) to add the gain from the second identical antenna system. However, this 3dB gain does not seem to affect my SNR much.
Am I adding the gain from the second antenna at the right place? Is the second system helping at all or should I use just one antenna with a preamplifier immediately after it?