Thank you for your quick response.
I've added the HTTP Monitor, and modified the HostHeader, but I'm finding that if the webserver is listening to all traffic, not specific host headers, SAM thinks it passes the test. For example, if I have a Dev server and it listens for everything on port 80, it seems that www.blah.com and www.google.com pass the SAM test. If I specify the host header in for the site, SAM would mark either of those Down since there is no Header being hosted as www.blah.com or www.google.com.