Larry,
If your 4 goes over, the rollbar will make a nice, big hole in the plexi, seen it first hand.
Of greater concern is whether the rollbar will then sink in soft earth... also seen that first hand.
It's not a terrible ideal to put a 4"x4", or whatever you deem suitable, plate on top of the rollbar to increase the rather small area up there. Then put your GPS antenna on top just for convenience.
Also, make sure that you have a canopy breaker... a big Bowie knife... to break out of there.
IMHO, a good rollbar is an absolute.
__________________
Vince Frazier
www.f1aircraft.com
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