recommended Motorola modem.? The problem is if I split the cable into my room I don't have enough power to watch TV and obtain a connection with the modem. It's one or the other. The line into the house is split three ways, then split again in my room. Three TVs and one modem in the house. The line to my room is over 30 years old. Will a booster help or do I need another line put in? If I need a signal booster what should I purchase exactly? Thanks!