One problem I found (using Google) when reviewing Lyle's book is that there appear to be a number of different standards for ground-to-air signalling, depending on the use context.
The RAF have published a booklet
Working With Search & Rescue Helicopters, but the only two hand signals I can find in it are arms overhead in static 'Y' (I need assistance/pick me up') and arms overhead crossing and uncrossing ('wave-off').
Anything else is probably best left to professionals, and general advice is "don't signal or wave to any aircraft unless you need assistance". The single arm aloft ('all okay') might be used if the aircraft is obviously checking you out.
That's my 'common sense' view, and would welcome correction from SAR types.