[Wiring amplifiers in parallel](https://www.analog.com/en/technical-articles/paralleling-amplifiers-improves-signal-to-noise-performance.html#) in a summing configuration improves the signal to noise ratio because amplifier noise in each LNA is uncorrulated. However, external noise sources will still be a factor because both LNAs receive those noise sources, thus the external noise sources are correlated.

With 2 LNAs, would any of these be useful to reduce the correlation of external noise sources? If so, what might be best?

* Physically rotate LNA1 90-degrees from LNA2
* Physically rotate LNA1 180-degrees from LNA2
* Mount one LNA flat on the board and one vertical or on its side (think horizontal vs vertical polarization)

-Eric, KJ7LNW