Cable Tv Extender Cable Tv???

Cable tv??? - cable tv extender

so that only Comcast cable in my room and the cable that plugs into the wall outlet and the back of my TV, but cable is not long enough, so much to my TV, there is a cable that can extend the cable Comsat
such as Comcast Cable, the extension to my TV or I can with a cable tv and put it on the wall of my
i WUS htinking coaxial cable is what I use, I can not buy and I found his thoughts WUS
If you have a coaxial cable, connect as on my TV and if there any special rules for coaxial cable?
Thank you!