If you can't find a suitable place to locate a dish, a bigger dish isn't likely to help. BUDs have very special mounting requirements and there aren't any viable shortcuts to supporting these relatively heavy, wind-catching antennas.
There are a number of >2 meter dishes (the bare minimum for more than occasional C-band reception) on eBay. BUDs typically aren't inexpensive and require substantial assembly as well as a well-designed and executed mounting arrangement (typically not included). It usually pencils out better to find a dish that someone is trying to get rid of and make transport arrangements to get it to you (again, not inexpensive).
What is your budget for the whole setup? Getting only some of the parts gets you nothing.
At this point in the project, your time is probably better spent researching rather than experimenting.
There are a number of >2 meter dishes (the bare minimum for more than occasional C-band reception) on eBay. BUDs typically aren't inexpensive and require substantial assembly as well as a well-designed and executed mounting arrangement (typically not included). It usually pencils out better to find a dish that someone is trying to get rid of and make transport arrangements to get it to you (again, not inexpensive).
What is your budget for the whole setup? Getting only some of the parts gets you nothing.
At this point in the project, your time is probably better spent researching rather than experimenting.