Antimatter Fuel Rod Module, 20x55, 48 Assemblers, Compact, Borg
Generates 6/sec. Actually this is a 21x55 tile, but it fits in nicely with my other 20-wide tiles, because almost all of them are actually 19-wide. So the only restriction is that you shouldn't place 21-wide tiles adjacent to each other N/S. Also, since antimatter rods are a 4-in, 1-out recipe, there is no tower slot available to import warpers. For this reason, one tower input has been left unused so you can run a belt from a nearby tower.