Hmmmm! Depends exactly what you are trying to achieve.
I am making the assumption that the equipment you are trying to shield is ground equipment and not part of an airborne avionics installation.
Obviously by far the best solution is full faraday cage type environment, this would require a total housing and good earth bonding .
Simply placing a metal sheet or similar in the direct path of the radar signal will not eliminate the interference, as signals at these frequencies reflect and refract easily, and will still interfere at this distance via multiple indirect paths.
There are commercially available RF screening hoods for testing military nose radars, which are designed to block external radiation. They contain a foam material which is carbon/graphite impregnated. This might be worth exploring if a simpler wrap around fix was needed.
If I recall correctly "Chelton" might make such products.
Cheers
G Clubber