In regulating the placement of a wireless telecommunications support structure, an authority may not:
(1) Regulate the placement of an antenna or related equipment for an existing wireless telecommunications support structure; provided, however, that, if the placement of an antenna on an existing wireless telecommunications support structure requires an extension, such placement may be regulated, if such extension would require the wireless telecommunications support structure to have lighting or if such extension exceeds the height limitation of the authority. If a co-location occurs, such co-location may not be considered an expansion, and the appropriate authority may not impose additional costs or operating restrictions on the applicant for such co-location, unless such support structure is owned by the authority;
(2) Require the applicant to provide any sort of justification for radio frequency need; or
(3) Act to prohibit or have the effect of prohibiting the provision of personal wireless services.