Expect to spend more if things get complicated, naturally. Even then, however, you can find active or optical 15-foot cables ...

Today's front page article about that TV with a wireless box for inputs [linky] got me thinking. Anyone with personal experience with wireless HDMI ...

He initially tried an HDMI-to-USB dongle and a streaming Raspberry Pi, however the latency was far too high to be useful. The extender does have a small delay, but not so bad as to be unusable.