[greghacke]

"Satelites and Bases are useless at a warp-point because fleets can choose to ignore them with their battle plans! The only things useful at a warp-point to keep your enemy out are mines, fighers, and ships."

Quite true regarding the battle plans, however...

Drop some mines, then place a base and/or satellites. The enemy must stop to deal with the mines. Put fighter bays in the base and some decent weapons and you'll maintain true control of the warp point. Additionally, throwing a Shipyard/Repair bay means you can build and mothball a mine layer for after battle re-seeding. Tossing in a low-tech Solar Panel for energy reduces your resupply needs considerablly too...