manolid if your house was built in the past 10 years, there is a pretty good chance its RG6. 18awg is thick and is the standard center core size for RG6 cable. My guess is that you have RG6.
RG59 is rated at 22 gauge for the center conductor.
120' of cable is pretty long and your ota signal will surely suffer. I would highly recommend a antenna preamp for your setup.
Good luck.
RG59 is rated at 22 gauge for the center conductor.
120' of cable is pretty long and your ota signal will surely suffer. I would highly recommend a antenna preamp for your setup.
Good luck.