Commercial communications antennas shall be a permitted-by-right use in all zoning districts if placed on an existing commercial communications tower, public utility transmission tower, or placed on any structure other than a single-family detached dwelling, duplex dwelling, townhouse dwelling or any other residential structure. Commercial communications antennas shall not be permitted on any residential accessory structure. A structure shall include, for these purposes, concrete or macadam pavement and/or a concrete slab. Further, Bath may require a visual impact analysis, as described in § 675-140 below, to be performed to ensure that any adverse visual impact created by the commercial communications antenna is mitigated.