Billboard Reflector Path Segment Gain Calculation clarification

[alexcpn]

As per WINNF-TS-1014 V 1.14

In Section 'R2-AIP-31 Interference Analysis involving Passive Sites' it is mentioned (about page 55

ii. The AFC System shall determine the effective path Segment gain of the Virtual Receiver, GPathSeg, as follows:
...
2. Single passive reflector:

...
DRx, Next: Diameter (meters) of the antenna at the next site towards the actual FS receiver, where the diameter is the back-to-back receive antenna diameter if the next site towards the actual FS receiver is a back-to-back repeater.

But for a single passive reflector this above sentence seems wrong as it is taking about back to back receive diameter

diameter is the back-to-back receive antenna diameter

For a single reflector what should be the value of DRx, Next be ?

[alexcpn]

this is the diameter of the next receiver 'r_diameter_m'