This has been quite a popular question recently due to the uptake of HDTV's and services providing content in High Definition and even Ultra High Definition.
The satellite which Freeview channels are located on is High Definition capable, it in fact has a range of PAY TV HD Channels to SKY customers with a relevant subscription. TVNZ 1, TVNZ 2, THREE and PRIME broadcast in HD for SKY Customers, but you may ask why?
When a broadcaster decides to go on Freeview, they have the option of going nationwide (Satellite) nationwide via UHF or in a local area or town. They also can decide if they would like to broadcast in SD (Standard Definition) or HD. Each element comes with a cost to enable to ability to broadcast to the broadcasters specifications, in the end it's up to the channel themselves to spend the extra money to broadcast in HD,
The Satellite capacity is near full, which means that broadcasters will need to work together to decide what HD content is available and if they would like enable anyone to tune them in. SKY owns majority of the capacity on the Optus D1 satellite so they can restrict what goes on and what is made available.
A good way to support HD on Freeview is to talk to the broadcasters themselves, if they receive a high interest then they could negotiate, however costs, rights and technology all comes into play in deciding what is being broadcasted.
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