I know I found me a 100' piece of 7/8" feed line 50 ohms, hollow center conductor with connectors installed. I tested the line with my radio at one end and a Motorola 1200B service monitor at the other and my receiver for 12db sinad was .25 micro volts. With the transmitter at 40 watts keyed, the power reading at the other end was 40 watts, this was checked at 146.000 Mhz.

I use 9913 for 10 meters. also if you find some 1/2" superflex, you can use the PL259 connector, you just have to solder the the outside to the sheild side, remove the center because the center conductor is a little larger than the center of the PL259. The use a "barrel" connector to attach inside feed line to radio. Just takes a little trial and error.......