Let me tell you about P-2
This coaxial cable came to life about 40 years ago. To improve the loss, they made bigger air bubble in the foam. The problem was that after been hanged on a strand for a while and been shaked by wind the center conductor move from the center of the cable and changed the impedance of the cable. The loss then became 20 to 40% higher than the original and nothing can be done to go back to original spec.
STAY AWAY FROM THAT CABLE......