Can I use copper house wire 12/ 2 or so to connect to the points on the
j pole then bring them to a so connector Then screw the rg8 pl
connector into that? Will this through off the swr? What ohms is 12/2
wire?

Stryped-

I suggest you obtain an SO-239 connector that mates with the PL-259 connector
on the cables. Connect it as close to the antenna terminals as possible.

Once you finish building and testing it, you need some way to connect to it.
Why not just make an SO-239 part of the antenna? Otherwise you would need a
piece of co-ax to connect permanently to the antenna.

The 12/2 wire's impedance can be calculated, but you would need a handbook to
find the formula. It depends on the diameter of the wires and spacing between
them. Insulation on the wires may affect the impedance, but probably not very
much unless they were twisted together. I think it would be best to keep any
such connecting wires as short as possible.

This cable is pretty thin and not rg8 but he said it was 50 ohms.
I plan on hooking the 20 feet from the swr to the antenna.

Smaller cable might be RG-58 if it is a little less than a quarter inch in
diameter. If it is around an eighth of an inch, it might be RG-174. If you
examine it closely you may find some markings.

73, Fred, K4DII