[ADTech]

I'd suspect that phasing won't be much of an issue since the F/B ratio of the antennas will pretty much ensure that the very weak signals from the opposite direction will be well attenuated, probably by 10 dB to 20 dB as compared to the desired signals off their intended antenna, and those opposite direction signals will be below the noise floor even after amplification.

Brute force amplification and combining has a decent chance of working in this situation.