OK. Sure hope no one saw me......
One of the cars has a 29" antenna and the other a 30".
The OTHER one ..... um. I couldn't FIND one. Hmmmm
I hate to ask you to look again but do the antennae have a round sort of like a cap on the very top? If it does I'm thinking maybe you could attach some kind of larger object on it to keep the flag from blowing off the top.