Found this, fairly recent article.
http://k3fs.blogspot.com/2008/07/goodyear-blimps.html
Ch. 1 - 451.800 - PL 151.4 - Max 35 watts
Ch. 2 - 451.8125 - PL 151.4 - Max 2 watts
Ch. 3 - 456.800 - PL 151.4 - Max 35 watts
Ch. 4 - 456.8125 - PL 151.4 - Max 2 watts
Ch. 5 - 464.500 - PL 151.4 - Max 35 watts
Ch. 6 - 464.550 - PL 151.4 - Max 35 watts
Ch. 7 - 469.500 - PL 151.4 - Max 2 watts
Ch. 8 - 469.550 - PL 151.4 - Max 2 Watts
It is noted that they use an Icom F40LT. The radio has three power settings, 1 watt, 2 1/2 watts, and 5 watts. They are to use the lowest setting that will complete communication.
Call sign is WPPH287. It was noted that there was not a VHF - High band radio on the blimp. They were not using the VHF-High frequencies that I have heard before for ground comms. I will list the VHF freqs licensed to Goodyear under this callsign, but there was no sign of them using these at this event.
27.490 - 35 Watts
35.040 - 35 Watts
43.040 - 35 Watts
151.505 - 35 Watts
151.5125 - 35 Watts
151.625 - 35 Watts
151.700 - 35 Watts
151.760 - 35 Watts
154.5275 - 35 Watts
158.400 - 35 Watts
158.4075 - 35 Watts