Improve Continuous Global Coverage

[trench8891]

The current global coverage solution requires altitudes above Kerbin that put the satellites beyond the range of omni antennas from the ground. This sucks, so currently I'm using a mod to add extra antenna parts so an omni antenna with sufficient range is available. The mod adds more than I really want though, so a better solution would be to provide global coverage with a lower semimajor axis.

Options:

1. Static rotating regular tetrahedron. This is probably impossible, but if it can be done the semimajor axis would only need to be 3x the radius of the parent body.
2. 6-satellite solution. Not elegant, but instead of equatorial and polar orbits could use 45 degree inclinations instead, which is significantly more appealing.
3. 8-satellite solution, described on a comment on an archived thread on r/KerbalAcademy. Essentially the same as 6-satellite solution, but even greater freedom in terms of semimajor axis.