From pdf folder on Thales netherlands website:

The STIR HP is a medium-to-long range tracking and illumination radar
system. The system has been designed primarily to control point and
area defence missile systems, such as Seasparrow, Aspide and
Standard Missile (SM1 and SM2) types of SAM systems as well as dual
purpose types of guns.

STIR HP systems are available in two different director configurations;
one director having a 1.8 m antenna, and another director with a 2.4 m
antenna.

Antenna
• Antenna type : Cassegrain with monopulse cluster
• Diameter antenna : 1.8 m or 2.4 m

Target acquisition and tracking capability up to:
– 1.8 m antenna version 200 km
– 2.4 m antenna version 500 km

http://www.thales-naval.com/pdf/stir%20hp.pdf