I finished this mission on my second try.
I took out the antenna as normal and took the helicopter from the Downtown police station. Luckily
I was shot down in sprinting distance from Phil Cassidy's old place, where I had my bulletproof van stashed in the garage. (From the decoy mission with Forbes, see Game FAQs.) I slipped inside for a health pickup and cruised down to the pay in spray in Vice Point.