Small Aircraft; Low Wing; 1 Eng; Fixed Gear
Flight Crew Commercial; Flight Crew Instrument
Flight Crew Last 90 Days 200; Flight Crew Total 1300
Communication Breakdown; Situational Awareness
ATC Issue All Types; Conflict NMAC
Flight Crew Took Evasive Action
Human Factors; Airspace Structure
Towing banner; getting a northbound transition with [ATC]. [ATC] did not advise of any traffic. When approaching [a local landmark]; I see the back end of a blimp off my right wing. I immediately descended to avoid collision.
A banner tow pilot reported an NMAC with a blimp not called out by ATC while transitioning through their airspace.