A HDMI cable can run only about 5 meters or 16 feet in length before attenuation degrades signal quality below acceptable levels. With better quality construction and materials, a HDMI cable can reach lengths of up to 15 meters or 49 feet. Practical cable lengths are usually much shorter – around 6 feet to 10 feet. This requires your HDTV to be placed close to the set-top box or Blu-ray player. If your audio/video equipment are all on the same piece of furniture, this isn’t much of a concern. But if you want to move your TV or re-arrange your home entertainment gears, HDMI cables can fall short.
The commonly used solution is HDMI extenders that allows you transmit HDMI signals over Ethernet cables up to 330 feet away. The process usually works as such: the HD source is connected to a HDMI transceiver through a standard Cat 5 or Cat 6 Ethernet cable and plugged in. The signal is then transmitted through the Ethernet cables to another transceiver, from which another HDMI cable carries the signal to the display source. The HDMI transceiver acts both as as an adapter and a repeater.
Cat 6 cables preserve the quality of video and audio signals better than Cat 5 cables and hence can run for longer lengths. These extenders are usually priced under $100, but if you look around you can even find them for as cheap as under $20.
Here are some HDMI over Ethernet extenders for your consideration.
Where are the devices for consideration?
It's right there in the post. These are Amazon links. You must have blocked Amazon or something if it's not showing up.
HDMI Ethernet Cables for Australia.