It is recommended that you use as little coaxial cable as you can.  Using too much coaxial cable can  result in as much as a 1/3 of the signal being lost. Less is more with coaxial cables.  Also do not coil the coaxial cable as this can cause signal loss.  Instead let the cord lay uncoiled if at all possible.    Again...less is more!

With the Sky 60 we recomend adding no more than 50 additional feet of coaxial cable along with the 30 that comes with it.