It just depends on your situation and how high you want to go. You can have free standing, eave mount, wall mount, chimney mount, roof-mounted tripod, whatever you can imagine. Much is determined by the shape, size and layout of your buildings and property.
A chain-link fence top rail is often suggested as a mast. That's a 10' stick, 1 3/8" (?) diam. Pretty cheap at the home center. If you want to go higher/longer, there are purpose built masts available that telescope up to 50' or so. These are secured with guy wires to the ground or roof.
Look at some of the online sellers of antenna mounting gear, like Solid Signal
http://www.solidsignal.com/c/product...ennas-supplies - Ronard is a well-known brand
http://www.ronard.com/