The outdoor company, which specialises in raised six-sheets on lamp-posts, started installing its advertising units last week after signing a deal with retail landlord The Junction.
The contract covers retail parks in Aberdeen, Aylesbury, Bristol, Hull, Leicester, London, Maidstone, Ox-ford, Paisley, Portsmouth, Thurrock, Worcester and two in Glasgow.
Louise Devlin, marketing manager at Streetbroadcast, said the win strengthened the firm's majority share of the destination shopping market.
"It is quite unusual to sign 14 contracts at once, as it normally occurs over time, on a park-by-park basis," Devlin said. "We are looking forward to working with The Junction, now and in the future."