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high-VHF reception on a UHF antenna can be hit or miss airplanes or not. Those that get lucky and have stable reception of VHF signals in this situation do so with normally strong to very strong signals with their antennas mounted outdoors.
With an antenna that is designed for RF 9 and 11, those problems should ease considerably.
Have you tried removing the splitter and testing stability of RF 9 and 11 with just the coax coming in from the antenna into one device? When you split signals you are reducing the strength of the signal within the coax that reaches your devices. Your run is pretty short, but it's worth it as a test just to confirm it's not a signal loss problem.
Cheers.
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