How to get OTA and Two DTV lines over two coax runs?

I hope this is an easy one but I haven't found an answer....

I have an OTA antenna run into my house and several DTV HD units.

In the Family room the HR21/AM21 combo and in the master bedroom the HR10-250

I have two cable runs to each location. The question is, how can I run the OTA and two Dtv runs over two cables? I hear a lot about SWM but not sure if that is available or if it'll work. I think i've read it won't work with the HR10-25, which I could live with. I really just need it in the family room for those times that DTV is unavailable.... rain/snow/etc..

Thanks!