SISO antenna on RUTX11

I have a network with 5 RUTX11 radios, where 1 is configured as an access point and the other 4 as clients, all configured in 2.4GHZ.

I would like to know if I can use SISO antennas, with only one polarization, on a single Wi-Fi port of the radio.

Do the two Wi-Fi ports of a radio transmit the same signal?