I try my best not to get too vindictive, but I feel it is necessary to do so this one time. I categorically, wouldn't even THINK of doing what you're contemplating! It begs the question, could you get away with doing so? Maybe. Perhaps. But why even try? It is, by any means, on the verge of illegality. Yes, it is perhaps a hobby, and it isn't commercial say like a NASCAR event. However, it isn't private, and it isn't in support of a charity! It is public, people pay to see the events, and therein lies the issue. I am not a lawyer, or judge, or a member of the FCC enforcement staff. But if I were, I would view this is a violation! You suit yourself, but I wouldn't touch it with a 50 foot pole!