You need to shift your entity my .5 pixels as in this example by skidracer:
http://www.blitzbasic.com/codearcs/codearcs.php?code=773
This is what does the trick: PositionEntity magic,-.5,-.5,0
http://www.blitzbasic.com/codearcs/codearcs.php?code=773
This is what does the trick: PositionEntity magic,-.5,-.5,0