So many scammers out there who hijack legitimate listings and try to pass them off on their own.
Several ways you can tell if it's legit or not...
Google the address --- is it showing up as for sale?
Drive by the property --- if there's a for sale sign, contact the realtor whose name is on the sign
Make appointment to meet the poster at the property itself. If poster is out of country, surely there must be someone he can entrust to take care of business?
By no means should you complete a formal application form with personal information about yourself before you are assured that this is a legitimate listing
Finally, don't wire money via Western Union (which seems to be favored by the scammers)....
If you are looking to rent, your best bet is to work with Property Management Companies serving Antioch --- google them, and talk with at least 2-3 agents who can help you.