Get some or make your own using Belden 1694A RG6 coax. The Belden will work great for your digital audio connections, too.
This stuff is solid center conductor so it's not super flexible, but for me that's not a problem. Belden makes similar cable with stranded center conductor but the specs are not quite as good. Whether or not you would see or hear a difference, I can't answer.
This stuff is solid center conductor so it's not super flexible, but for me that's not a problem. Belden makes similar cable with stranded center conductor but the specs are not quite as good. Whether or not you would see or hear a difference, I can't answer.