You will also need to switch your cable/antennea switch in the upper righthand cupboard and re-program your TV for cable. Re-programming is not a hard task and should be easily done from the hand-held remote. Hit menu, then set the TV to cable and go on down to program. The TV will do the rest. Also, remember to turn off the signal booster on the cable/TV switch. There should be a small green light on if you are using the Antenna, it will be on the faceplate of the switch in that cupboard. If you have not used it before, try it next time. Signal strength will be better and so will the picture on antenna. Might be behind the plugs and not immediately visible, but it is there. 25 foot cable should be about right. I use a RE-useable cable tie, to keep the cable neat and only roll off as much as I need each time. Keeps things neater in the storage bay.