Not to send people away from here, but read this for information on the HR20-700's OTA tuner.
TechLore Blog
HR10-250, Samsung SIR-S4120R, SIR-S4080R, 2 Philips DSR704s (one connected to a Slingbox A/V). One box used the "Zipper"; rest used PTVnet to enable networking features.
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