My setup uses 'comm arrays' (as I call them) that are essentially unmanned space stations (go big or go home) with a large solar array on one side and the array of dishes and antennas on the other. Four in orbit around Kerbin, at an altitude of ~1000km. I don't use 1000km orbits for anything else, so they're out of the way. Each has two omnis (Communotron 32s or occasionally AIES omnis) to connect to eachother and KSC; only one is needed but I like the symmetry. Next up are two short range dishes, one pointed at the Mun and one at Minmus. It also has four medium range dishes (Moho, Eve, Duna and Dres). Finally 3 dishes from the longest range category. One points at Jool, one points at Eeloo, and one points at Active Vessel. That last one means I generally have a connection when I'm out in Kerbol orbit performing interplanetary manuevers.