Does posting it twice increase the likelihood of finding the person/company you seek?
Posting some contact information would be a more productive strategy. Especially since "Central Valley, California" is a very large area, and where you are would be more useful than the type of antenna you're swapping out.
A person in, say, Redding may not be interested in driving to, say, Bakersfield to climb a tower for you, but someone in Fresno or Lancaster might. Helps to provide more granular location information.