multi room sets trying to run another set in br from same box[SERIES 4] using an hd splitter and 50' of hd cable. its not working. i've purchased 2 tivo's in the last 4 yrs & now they want me to buy another tivo unit plus another extender for$230. + $60. a yr on top of the $190. i'm spending now. has anyone had any luck running 2 sets off of 1 box? ir repeater for remote working great. i've seen some ideas with series 2&3 but not 4's.