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I <br /> above the height of an existing building nor project more than ten feet <br /> above the height limit of the zoning district within which the facility is <br /> located. Personal wireless service facilities may be located on an <br /> existing building that is legally nonconforming with respect to height, <br /> or has received a height variance, provided that the facilities do not <br /> project above the existing building height. <br /> (4) Height, Existing Structures: New antennas located on any of the <br /> following structures existing on the effective date of this bylaw shall <br /> be exempt from the height restrictions of this bylaw provided that <br /> there is no increase in height of the existing structure as a result of the <br /> installation of a personal wireless service facility: water towers, guyed <br /> towers, lattice towers, fire towers and monopoles. <br /> (5) Height, Existing Structures, (Utility): New antennas located on any of <br /> the following existing structures shall be exempt from the height <br /> restrictions of this bylaw, provided that there is no more than a twenty <br /> (20) foot increase in the height of the existing structure as a result of <br /> the installation of a personal wireless service facility: electric <br /> transmission and distribution towers, telephone poles and similar <br /> existing utility structures. This exemption shall not apply in Historic <br /> Districts, within 300 feet of structures or places listed in the <br /> Massachusetts State Register of Historic Places, within 150 feet of the <br /> right-of-way of any designated scenic roadway, or within 300 feet of <br /> any Great Pond or tidal water body. <br /> (6) Height, Wireless Facility Overlay District: Within the Wireless <br /> Facility Overlay District (as described in Subsection 174-5.C.), <br /> personal wireless service facilities of up to 100 feet in height may be <br /> permitted by Special Permit, except that the Planning Board may grant <br /> a waiver to allow a height of up to 200 feet where circumstances <br /> warrant (e.g. no serious impact on neighboring properties, residential <br /> areas, historic districts, historic places or scenic vistas, along with the <br /> opportunity to eliminate a larger number of towers of lower height <br /> which might result in such impacts). Monopoles are the preferred type <br /> of mount for such taller structures. Such structures shall comply with <br /> all setback and Special Permit Regulations set forth in this Bylaw. <br /> (7) Setbacks: All personal wireless service facilities and their equipment <br /> shelters shall comply with the building setback provisions of the <br /> zoning district in which the facilities are located. In addition, the <br /> following setbacks shall be observed: <br /> (a) In order to ensure public safety and prevent hazards to people <br /> and neighboring property from potential facility collapse or <br /> falling ice or other debris, the minimum distance from the base <br /> of any ground-mounted personal wireless service facility to <br /> any property line, road, habitable dwelling, business or <br /> institutional use, or public recreational area shall be the height <br />