Add a box, pay double?

I have a Premiere XL to record OTA now and am considering a second box in our RV. The RV box would be for both OTA or campground-provided cable. I just wanted to confirm that if I add a second box I have to pay another full subscription for that box, there is no multi-unit discount? About $28? Seems a crazy price per month for a programming guide. TIA


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