ORIGINAL: 378
If you're serious then it's for the best you use a Redcat. They're cheap enough to easily replace, which is a given since the car is going to shatter when it comes back down regardless of who made it.
As for actually doing it....eh I wouldn't. But I value the structural integrity of my RCs so take that as you will. But if you must, just scale one of those plastic BMX ramps up to about roof height, hit it at the top of the rev band in second gear and hope you don't hit someone suehappy when it comes back down.
dont put down what you dont own.
i have jumped my redcat tornado epx pro hundreds of times of those skate board ramps.
at the end of last summer, i wanted more hight! so i told my buddy to kneel behind the ramp and hold it at a steeper angle. nearly double its normal angle.
the 1st attempt failled as the buggy hit the ramp so hard it knocked it loose of my friend's hands!
2nd try he reduced the angle alittle. about 60 degrees. this time the buggy hit the ramp, went up it and flew nearly straight up. landed only 6-7 feet past the jump, as the steep angle caused it to go more up than over.
nothing broken or bent. tough little buggy.
Oh, the epx pro is the brushless version, and was running a 2s lipo. hitting the ramp at 30-35mph(i didnt have room for full speed) thats the speed of many nitros.
anyway, to the OP, do you want to jump onto the roof....or over it? a ramp that increases in angle towards the end will give more hight and less distance.
a longer jump with a linear angle will provide better distance, but will have to be higher at the end.