When using Pavel Demin's six-band receiver for the Red Pitaya, it is is possible to assign each receiver to either the IN1 or IN2 ports. This allows antennas for different bands to be used.
This can be configured by modifying the command line parameters in /sbin/discovery.sh on the Red Pitaya SD card. In the following example, the first three receivers are connected to IN1 and last three receivers are connected to IN2:
/opt/redpitaya/bin/sdr-receiver-hpsdr 1 1 1 2 2 2 &