VHF, UHF, .... the important fact is that pilots were on different frequencies...whatever spectrum band they were on, is less relevant.
But for those rebuking any mentioning of a VHF Heli frequency, please provide some proof as any reference I find on VFR sectionals, is a VHF Heli-frequency.
IFR charts only have the regular VHF+UHF TWR freq.
