If you only have one receiver then you need to run a new HDMI cable from that receiver to the bedroom (through an HDMI splitter) for HD programming there. You will have to watch the same channel on both TV's but it will work. You should also get an RF remote and the RF update for the H25.
If you want to be able to watch 2 different channels simultaneously then you will need one receiver at each TV. To accomplish this you will need to add the DirecTV SWM splitter into your current coax setup and run that new cable to the second TV location.