An Earth satellite so positioned that it appears stationary to an observer on Earth is called a geostationary?

http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/970408d.html

Communications (TV) satellites such as Hotbird and Astra orbit at 36,000km above the earth.

22,300 miles over the equator..... A geostationary satellite is an earth-orbiting satellite, placed at an altitude of approximately 35,800 kilometers (22,300 miles) directly over the equator, that revolves in the same direction the earth rotates (west to east). At this altitude, one orbit takes 24 hours, the same length of time as the earth requires to rotate once on its axis. The term geostationary comes from the fact that such a satellite appears nearly stationary in the sky as seen by a ground-based observer. (Saunders, 2006, para. 1).

one revolution of itself, or one revolution of the Earth?

impossible to answer w/out knowing the speed the satelite is going. the higher it is the faster it will hav to go to appear stationary in sky

Isn't it something like 50km? Or that might just be completely wrong.... Ok yeah I was completely wrong :D It's something like 35,000 lol

35,000 km .

The satellite orbits in the direction of the Earth's rotation, at an altitude of approximately 35,786 km (22,240 statute miles) above ground. This altitude is significant because it produces an orbital period equal to the Earth's period of rotation, known as the sidereal day.