HD200 does not have an external diplexor. If you combine the D* and OTA signals at the multiswitch, you will need a separate diplexor to separate the signals for input into the HD200. (The HD200 has a Satellite input, Ant input, and Cable input.) A diplexor is obviously not needed in you make 2 coax runs (one for D* and one for OTA).
I fed my antenna into a 5x8 Spaun multiswitch and am using Spaun diplexors to separate D* and OTA signals for a HD200 and DTivos.
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