In an ad-hoc radio communication system comprising a plurality of stations formed into at least one network, each station is assigned a rank representative of its suitability for performing the role of master station in a network. The corner reinforcement comprises a top panel and two downwardly extending side panels and fits over the top end of a corner post to better distribute the load across the entire top end of the corner post and to reinforce the corner of the package to prevent the post and package from buckling, crushing or otherwise failing. The first mask includes a plurality of line patterns arranged in a second direction.