Jeff,
I did some poking around about an FM Transmitter some time back, and here are a few things I found out
1. This is what the local SCCA SFR folks use http://www.decade.ca/en/products.php?prd=777560932 This has been around a while, so there might be newer or better technology around. There are much cheaper models with similar power out there, but I don’t know enough about transmitters to know whether spending the extra $$ is necessary
2. Interfering with an airports signal is a No-No. There are range limits on the broadcast strength and proximity to airports. Would this be a problem for Marina ariport events? It’s related to the Part 15 of a FCC regulation http://en.wikipedia.org/wiki/Title_47_CFR_Part_15.
Any more technical folks have though on this?
Thanks
James