Abstract: A locking arrangement for preventing the theft of CB radios or the like from a mounting bracket in a vehicle including a locking device preventing access to the heads of the bolts which attach the radio to the bracket. The arrangement includes a hollow tubular housing or sleeve member provided with openings whereby it is bolted in place by the bolts which mount the CB radio to the mounting bracket. A bar member is slidable into the housing member to cover the heads of the mounting bolts, and a lock is provided for locking the bar in place in the housing member.