Broadcasters and cable operators are on the same page when it comes to the FCC doing lots more looking before leaping into expanding terrestrial wireless access to the C Band spectrum.

That came in a joint filing that included the American Cable Association and NCTA-The Internet & Television Association, the National Association of Broadcasters and NPR.

They point out in a joint letter to the commission that video and audio programming delivered via the C Band serves 142 million Americans, representing what they called "the backbone of the infrastructure for delivering video content to American consumers.”

[Read: NAB, NTA Object To C Band Wireless Service Use]

The FCC sought input on the band as part of the MOBILE NOW Act requirement it produce a report on expanding access, as well as in its Notice of Inquiry on expanding use of midband spectrum.

To make the point that the FCC still has a lot of questions to answer, they listed more than 40 in their letter, including how interference risks would be mitigated if the band is repacked; how the FCC determines whether or not they will be effective; how big would the guard band between new wireless users and incumbent broadcast and cable users; how incumbents would be compensated if the band is repacked and spectrum auctioned to wireless; what costs would be reimbursed; and the veritable host of others.

The bottom line, they say, is that "much more information is required before the commission can make an informed decision."

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