I've never had problems with this string and it has always downnloaded me the right and last version of the softcam feed that i usually install on a clean image...
wget -O - -q http://updates.mynonpublic.com/oea/feed | bash
Yes, the guy tried to add a base URL (with empty source), using the GUI MENU in OpenATV - as a new feed package source. But that won't work. Only if a specific URL was added with components that exactly specify the OE version (if needed some version) and also that exactly specify the chipset / architecture.