Many years ago, I was an Airframe/Engine fitter in the RAAF, working in the fibreglass shop, in No. 11 squadron, operating the Lockheed P3B Orion.
We overhauled both the forward and aft radomes for that aircraft, the forward one being coated in black poly, and the rear one getting coated in white.
The P3 has all-around radar coverage, with these two antenna, and I'm not aware of any difference in the performance of the fwd or aft coverage, over many years of flying both the 'B' and 'C' models.
"great times!"
Cheers