I also have mine mounted on an "air conditioner" type concrete pad. You can buy preformed pads (probably needs to be purchased locally due to weight) or you can pour your own.
Here's a company that sells preformed pads, they're not super expensive: http://www.confab-precast.com/cat_air.cfm although shipping may be cost prohibitive on a 250# chunk of concrete. It'd be pretty funny to see a FedEX guy try to haul that to your doorstepIf you have a home depot or lowes or scotty's locally they might have these in stock.
You could also pour your own so you get the perfect size/shape you want. Basically you get four 2x4's and nail them together to form the rectangle you want, then pour the concrete in and smooth the top. Here's a video: http://www.instructables.com/id/How-...Concrete-Slab/
edit: here's what mine looks like to give you an idea:![]()
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