Your best bet is to get hold of Stark Electronics in Worcester,
http://www/starkelectronic.com
as they are dealers for everything in the deep-fringe package. One question, however: How can you be so far from Boston on the North Shore that you need that extreme an antenna system? Unless you live behind a hill in Newburyport, chances are good that you can use less antenna and still get a good signal. Let me know...