Any antenna or tower that is not operated for a continuous period of ninety (90) days shall be considered abandoned, and the owner of such antenna or tower shall remove the same within ninety (90) days of receipt of notice from the Town of Fountain Hills notifying the owner of such abandonment. Failure to remove an abandoned antenna or tower within said ninety (90) day period shall be grounds to remove the tower or antenna at the owner's expense. If there are two or more users of a single tower, then this provision shall not become effective until all users cease using the tower for the prescribed period.