Minimum orbit over Kerbin for 3 sat relay?

[F'lar]

I'm trying to figure out the minimum orbit necessary for a 3 sat relay to have line of sight with each other. I trig'd it out using Kerbin's radius of 600k only to realize that the sphere of Kerbin would still block line of sight.
After some very crude calculations - I'm talking about a ruler on paper here, guys! hehe - I came up with a minimum orbit of 1.2+ million meters to have line of sight. Can someone confirm that or point me to a source where I can calculate that on my own?

Thanks

[rooge]

Look at this: Resonant Orbit Calculator For Kerbal Space Program [meyerweb.com]

[F'lar]

Is that calculating from the surface of Kerbin? I did my calcs from the center of the body.

Edit: Ok, I must not have had enough coffee yet. My calc of 1.2+ Mm is based from the core of Kerbin, meaning the orbit would need to be a minimum of 601,663m. Looks like that agrees with te sight. Thanks for the link. :)