Power Supply converts from 120 VAC to (usually) DC Voltage (12-24 VAC, depending on manufacturer),
which is a FLOATING output between center and outer coax shield....so no ground loop issues. The
only connection to GROUND for the coax is at the Grounding Block.....Mast Mounted Preamp end of
the coax is NOT grounded, although the Metal case for a few Preamps (e.g. CM-7777) may be connected
to GROUND by way of being attached to the Mast.
Coax from an EXTERNAL antenna must go through a Grounding Block close to the building entry point.
Grounding Block MUST have a relatively short connection to GROUND, such as AC Power Breaker Panel, etc.
Antenna MAST (or eave mount) MUST also have as short a connection to GROUND as possible.
I'm surprised the above links didn't show the National Electric Code (NEC) mandated Grounding Block.
Fol. Sat Dish Grounding Instructions also apply to OTA Antennas:
And why everything needs to be grounded:
Fol. Channel Master Installation Guide may also be of interest, although it is fairly old:
http://manuals.solidsignal.com/AntInstallGuide.pdfEdited by holl_ands - 1/29/13 at 12:24pm