The advantage of this planning method is that even if there strong interference conditions where one of the links suffers from fade while the second one does not experience degradation, the complete isolation of the two channels ensure a stable CIR.
However the aforementioned planning leads to low spectral efficiency. Most of the time even smaller angles in the antenna separation (such as 30°) are enough to allow both links to share the same frequency. In Fig. 3 we show a similar scenario to Fig. 2 but with antenna separation at AN of 30° which enables both link to use the two channels. Let’s assume, for the purpose of this example, that a required CIR of 40 dB is satisfied in both links.