Kimber claimed that their HD19 HDMI can go up to 20 meter long. They are not inexpensive though.
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According to the (very reliable) HT dealer who did my install, 25 feet is just about the point where HDMI cabling gets iffy. Give it a try - my set up (HDMI to the projector at rear of the room from electronics app 25' linear feet away, near the screen) worked out well. If you have trouble, I understand that HDMI repeater/amplifiers are available, but can get expensive.