A satellite flies at a height above the ground equal to twice the Earth's radius.

Near a planet, $g = \dfrac{GM}{R^2}$; at a distance $r$ from its centre, $g$ falls as $\dfrac{1}{r^2}$. On the Earth's surface $g = 9.8\ \text{m/s}^2$; at $n$ Earth radii above the ground it is $\dfrac{9.8}{(1 + n)^2}\ \text{m/s}^2$.