Location: Evanston IL 60202 11 mi from Chicago transmitters
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Roof rafters in snow country are plenty big enough to hold a 5LNB dish. Some installers are just intimidated by the idea of working on a roof and or don't have the equipment to find a rafter. Whenever I go up there to check or work on a dish or antenna, I get the willies for a while before I get used to being up there. It can be scary. I guess a high wind, no snow area might mean a higher wind load on a lighter rafter to the point of causing a problem but I doubt it. 5LNB dishes should also be mounted with two struts called monopoles to create a tripod effect. It's very strong but takes a little more time. DirecTV contracted installers get paid very little and want to spend as little time as possible at the job site. Paying an experienced professional a decent amount out of pocket to do a better job than a DirecTV subcontractor may be worth it.
While I may link to and mention products as examples, I don't recommend specific products.
I have my at9 dish installed at the edge of my roof. I purchased the antenna from Ebay and installed it myself. Since it was installed at the edge I could see the rafters and I made sure it was centered and lag screws went into them.
At the time the outriggers were not available. I have now purchased them but not installed them yet. I have gone through several Santa Ana wind storms with no problems.