at first there were not enough radios to issue to each patrol and those available were of the pye "bantam" type used by the police, which did not have sufficient range. as a result, udr patrols were issued with pockets of small change to use in telephone boxes in order to effectively report back to base. when radios were issued they were of the type used by the regular army such as larkspur a41 manpacks, b47 and c42 vehicle mounted sets. over time these were replaced with "stornophones" as vehicle sets with preselected frequencies which operated on the ninet rebroadcast system, working through masts strategically placed on various high points throughout northern ireland such as slieve croob. pyephones continued to be used for foot patrols but the range of these sets gradually improved. each battalion was able to communicate with other battalions using c42's and b47's installed in the battalion or company operations room (ops room) or communications centre (comcen) as well as the bid 150 system of cryptic coding and scrambler telephone system.