HDMI Extenders or Repeaters are a great option for those times where a HDMI Cable isn't long enough. Generally the maximum distance that a passive HDMI Cable can offer is up to 20m. These devices allow distances of up to 100m.
HDMI Extender & Repeater Products
HDMI Extender over Cat5e/Cat6 up to 30m
HDMI over IP Extender (Single Cat5e/Cat6) up to 100m