EA4TX RemoteBox Series Hardware Reference & Operational Manual page 22

It can be configured different outputs for Radio A and Radio B.
Remember to select the true table for Radio A and then for Radio B. You can
use the "Copy A->B" to use the same setting at Radio B as used at Radio A.
When it's used a RemoteBox of 6 antennas, that setup will be fixed to 6
Antennas.
Page 22
Hardware Reference and Operational Manual: RemoteBox