From http://www.abccables.com/info-rg59-vs-rg6.html
RG6 should be used exclusively for satellite hookups and digital CATV. RG59 is fine for analog CATV signals but will not support the higher bandwidth used for satellite signals.
Generally speaking, RG6U can replace 5C-2V coaxial cable because these are cables with very similar characteristics. RG6U cable is even better because it has lesser attenuation than 5C-2V. So you can...
Coaxial cable is an electrical cable with one wire in the center surrounded by a layer of insulation which is then surrounded by an outer braided cylindrical conductor and finally covered with...
Most times they are the same but a satellite signal needs to be carried by RG6 cable it is a heavier gauge wire then say RG59. Regular or analog cable signal is sometimes carried by RG59 but digital...