Thanks Victor X-ray on the FME connector info. and Congratulations on your first post here on BatLabs!
As for what //otoguy is trying to accomplish.....
A Larsen UHF antenna or other on a magmount placed on a file cabinet or other piece of steel may just do the trick. UHF usually penetrates well into buildings but the closer you are to a window the better off you will be, as well.
Also, I have seen the magmount antennas inverted and placed upon the suspended drop ceiling cross braces too.
I know these are not ideal setups but they are a midway compromise between what you were originally suggesting (House wiring as an antenna) and the full blown 9913 coax and the proper outside base antenna.
Of course if you are trying to only transmit/receive in one direction (say to a repeater or city a distance away) a small UHF beam antenna may be just what you need. Expermentation with the radio connected and moving the beam antenna toward the general direction of the intended signal will get you homed in. You might could get by mounting this inside your building , but for the optimum setup, a clear somewhat high placement outside (roofline)of this beam will generally yield the better results.
I use a wideband discone antenna placed in my attic space with a good quality 9913 coax here at home [antenna restrictions
] for general listening & Amateur Radio Usage and it seems to work well.