Gungahlin should have no problems (hopefully) for local digital TV.
For satellite, what you would need is at least a C-Band and/or Ku-Band dish (depending on what channels you want to watch). Lyngsat (http://www.lyngsat.com) has information on what satellites are avalible for Australia (note that some C-Band (the 4 digit frequency numbers) and some Ku-Band (5 digit frequency numbers) are not avalible in the ACT due to the location we are in).
http://www.vetrun.com is a good place to help try and find FTA satellite signals.
Europe and UK TV is hard to get in Australia due to (unless it is broadcasted on a satellite that can be viewed) the location of the satellites compared to Australia and the beams (ie. transmissions) being directed usually to the UK and Europe.
Also, you most likely would need a positioner and maybe more than one LNB (low noise block) on the dish depending on what satellites you want to pick up.
Kaz Electronics (who have a rep. on this forum (Gadget)) deals with satellite installations and I suggest that you contact them to try and organise what you need.
So, visit www.lyngsat.com, www.vetrun.com and contact Kaz Electronics.
BTW. With the right size Ku band dish, you can pick up ABC feeds off Optus B1 (which I can't due to my dish being a bit too small (65cm) for Optus B1).