CHAPTER 18. RADIO AND TELEVISION ANTENNAE.
Sec. 18.14. Minimum requirements for erection of antenna.
Whether or not an application for a permit to erect a radio or television
antenna is required, the following minimum requirements shall be complied with
in the erection of an antenna:
Masts. The antenna mast or tower shall
be secured to a structure strong enough to carry the weight of the installation
with necessary allowance for wind and vibration. Any mast which measures more
than twenty feet in height shall be of the telescopic type. Each section shall
be not greater than eleven feet in length. All telescopic masts shall be
adequately locked at intervals not to exceed eleven feet. All masts shall be
mounted in a base which must be secured to the supporting structure by no less
than two lag bolts no smaller than one-quarter inch diameter.
wires. A mast which extends more than ten feet above the top of its base
shall be strengthened with four guy wires spaced approximately equally about its
circumference. Masts over twenty feet in height shall be strengthened with
similar sets of guys at approximately ten-foot intervals. All wires used in
supporting masts as specified herein shall be of the stranded type of not less
than six strands of twenty gauge wire.
Self-supporting towers. All
self-supporting towers shall be mounted in a concrete foundation, the dimensions
of which shall be not less than twenty-four inches square and four feet deep.
The height of all self-supporting towers shall not exceed a total of sixty feet
above the ground base level.
Crank or rigid type towers. All towers
of the crank or rigid type construction shall be strengthened with three
approximately equally spaced guy wires each equal in strength to two
six-twentieths stranded type at intervals not to exceed twenty feet. All such
guyed towers shall be mounted in or on a concrete foundation, the dimensions of
which shall not be less than eighteen inches square and two feet in
Grounds. Every metal mast or tower shall be grounded by a
conductor of not less than ten wire. The conductor shall be bonded to a water
pipe if possible, otherwise to an electrode which has a diameter of not less
than five-eighths inch and a length of not less than eight feet properly
imbedded in the earth.
Lightning arresters. A lightning arrester
suitable for the frequency for which the television apparatus is designed and
approved by the Underwriters' Laboratories, Inc., for television leads shall be
provided for each lead-in conductor and shall be located outside of the building
and as near as practicable to the entrance of the conductor into the building.
The arrester shall not be located near combustible material or in a hazardous
location. (Ord. No. 468, § 8.)