Go to the RR Wiki for Blue Angels. The freqs in use and found during the ATL show (last weekend) are there. They allowed scanners, but no two-way radios (for safety) at the Atlanta show. Maybe NASJAX show is different.
I don't know whether the Blues or TBirds are flying at the JAX show, but we have an article for each. Be sure to read the Monitoring the Air Show Experience article (it's a PDF) linked on both articles as well.