I can remember watching a DanAir 727 take off and head south on that radar. After a while, it disappeared, then reappeared. The controller said it had probably just accelerated through the radars (something?) speed, at which the radar couldn't see the traffic. The antenna was huge, about a quarter moon shape, painted red. About 10 rpm, I guess. The other, higher frequency radar was prone to show weather and was only used for SRAs or in case of unavailability of the main radar.