i am running my radar box and it is only picking up 10 aircraft but my sbs-1 is picking up 60 aircraft,i have swapped the aerials around and the aerial appears to be working fine.the msgs bar at the botton reads 2 msgs/5 secs.why would the radarbox only pick up 10 aircraft and the sbs-1 pick up 60,is there a problem with myu radarbox and if so hoe do i fix it.the box was reading over 60 aircraft this morning but now its down to a mear 10