PCB with 5 Pluggable RF modules and 1 LTE puggable module - will it cause issues for reception at different antennas?
Given low-Q (PI?) input matching filtering CLC networks in each radio between the Antenna and the Low Noise Amplifier, you will experience blocking. The channel spacing of 400KHz, at 900 MHz, requires Q of 900*2.5 or over 3,000X to be beneficial. I'd plan on at least 10 milliWatt (+10dm) of the radiated 150milliWatt, to couple into the adjacent antennas. Can your frontends (the LNAs, the mixers if there is no LNA) avoid the serious de-sensitization of an inband +10dBm interferer? IMHO if you expect success here, you must control TIMING of remote and local transmissions. 

Additionally, 10 milliWatts may exceed the "safe constant exposure input power" of the receivers.