To have a groundmounted quarter wave vertical with a decent efficiency you need at least 16 radials.
So normally you would spread them out on the ground evenly around the base. This would give an angle of 360/16 = 22,5 degrees between two radials.
Would it make a great difference in efficiency to use the same amount of radials of the same length but to spread them out like this: 4 radials 5 degrees apart, then 75 degrees then again 4 radials 5 degrees apart and so on? Or would this only be as efficient as 4 radials?