all above correct, one suggestion, watch the hr20's ,, not all are compatable,, look on the rear of receiver above the sat-in port, if it is compatable it will have the SWM lettering above port ,, if not present it will not pick up the swm signal,, hopefully you won't see many of the hr20's for new installs, but you will need to check them if customers are doing upgrades .......... other than that post above is right on the money
Rick Terrell
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