Are Directv Receivers Dual Band or Single Band IR?

I am installing a remote location and require setting up an IR receiver in one room to run to a a transmitter in separate room with Directv boxes (amongst other equipment).

Does Directv use Single Band or Dual Band IR in it's remotes/receivers?

Specifically H21, H25, and HR22/HR23/HR24 (I can't remember which model I have 🙂

Thanks!