What type of cable do I need for a TV antenna?

The connection from your antenna to your TV is every bit as important as the antenna itself. You need a high-quality coaxial cable (“coax” for short) for the job. Coax has a center wire that carries the signal and is surrounded by a plastic insulator. Then there’s an outer braid that shields the center cable from interference, and an outer sheath to protect the cable from the elements.

Don’t be tempted to save a few dollars reusing old coax. Buy new coax in the length you need. Try to avoid coupling two cables together, as each union will result in a little signal loss. The most common type of cable for TV is called RG-6.

Advice
Predicting which antenna will work with certainty is almost impossible. The information garnered from sites like TV Fool will provide a strong indication of what should work, but there are other variables at work.

In some areas, especially in cities or areas with lots of hills, signals can bounce off obstacles like buildings and cause interference, trees can grow leaves in the spring and block stations you got fine in the winter, and atmospheric conditions can alter the way signals reach your house.

Moving an antenna just a little to one side or up and down a window can have a big effect on reception. If you’re putting up an external antenna, one side of your roof might bring in nothing while the other side provides perfect reception.

From : http://www.hj-antenna.com/type-cable-need-tv-antenna/