Not to be prejudiced or anything but it makes me wonder why someone in Egypt would want to know how high an RC plane can go.
It really doesn't make sense to worry about altittude questions like this no matter who from.
1.At very high altitudes a pilot would not be able to see the aircraft well enough to have any meaningfull control over it.
2. Those that would mean us harm already have much better means and funding than RC airplanes.
If you do attempt high altitude flight you might want to look into an altimeter (Can be bought pretty inexpensively from hobby shops dealing in sport rocketry) it would be nice to know just how high you went.