I will answer Alien_MasterMynd question on GSh for C-25 Berkut system in this thread.

C-25 actually had an additional pair of auxiliary wide beam receiving antennas installed: one for elevation and one for azimuth. Here are the pictures from the 1967 C-25 Mod2 field testing album:

Far view, both GSh system antennas visible near their respective main channel elevation and azimuth antennas:



Close side view on the GSh-epsilon antenna:


Close side view on the GSh-beta antenna:



Shelves containing GSh circuits: It must be noted that GSh wiring in C-25 was done in a different way than in C-75 or C-125 (without using log amplifiers); this allowed to use GSh while in SDC mode in Berkut simultaneously (Voklhov/Neva could not use GShV/GShN in SDC mode).



And finally, amazing photos showing angle-jamming target in indicators at various ranges (d= 40, 30, 20, 15).