I would advise you to involve the cable company here, but the typical cable tv trunk lines I would run outside are RG11 cable sweep tested as high as possible (2 GHz would be the minimum I would accept)--make sure the jacket is UV resistant. Yes this stuff is a bear to work with, but the loss is minimal compared to equivalent length RG6 or RG59. Otherwise, your alternative is to get cable into the closest entry into the closest building, put your cable modem there, then run multimode fiber to the other building between ethernet switches, then finally CAT5 to your production room.

What kind of bandwidth are we dealing with here?