The F117 Nighthawk is underperforming in terms of its stealth characteristics.
The F-117 had an extraordinarily low RCS: 0.0025 m2
To make a comparison, the B-52 Stratofortress has an RCS of 100 m2
The slab-sided aspect of the F-117 safeguarded from specular reflection and reduced diffraction, minimizing the total radar return. Swept wings protected the front of the plane from radar energy and the shielded canopy prevented radar reflection. Furthermore, the radar cross section was further reduced by radar-absorbing materials that covered the whole body. Engine inlets were placed above the wings and inlet ducts curved very slightly down to the compressor, acting as a shield. Moreover, engine intakes were protected by grids to impede radar waves from entering and reflecting back to the receiver. The cockpit’s windows were metalized to prevent radar energy reflection after hitting corner reflectors. (ref. Crickmore, Paul F. Lockheed F-117 Nighthawk Stealth Fighter. Vol. 16, Osprey Publishing)
Figure 9(a) shows that F-117A performs well in the direction between about θ = 0° ± 60°. Tis is an important angle domain to a military aircraft. It also performs well in its tail direction between
about θ = 180° ± 65°. PD in both domains is much smaller than 0.5 and the target can be regarded as perfectly stealthy. In the side direction between about 60° to 115°, F-117A performs
not so well, PD can always exceed 0.5, but if the detection distance increases (so SNR decreases), PD will decrease fast synchronously in the whole angle domain. (ref https://www.researchgate.net/publication/282966529_Calculation_of_Aircraft_Target's_Single-Pulse_Detection_Probability)
A post on the reddit clearly marks this as the case: https://www.reddit.com/r/Warthunder/comments/1gcvrw7/the_f117_has_been_nerfed_with_a_very_high_rear/?share_id=v9w4z3UeBzxNhs0byu2OM&utm_medium=ios_app&utm_name=iossmf&utm_source=share&utm_term=3
with a graphic which shows how the aircraft has poor ability to evade detection from its rear:
This image also shows the same data: (ref researchgate net publication 256805054_An_Accurate_Multistatic_Radar_RCS_MRCS_for_Airhawk_F117_Stealthy_Target)
It is clear that gaijin has created this aircraft, not because it is a functional platform, but rather to test stealth as a game mechanic. It is for this reason that I do not understand why they have chosen to reduce it’s capabilities. In ARB this aircraft will be virtually useless due to its complete lack of countermeasures, and offensive armament, and in GRB will suffer, as we can see that unless it is heading straight for the vehicle attempting to aquire a radar lock, it will not have any effective measure to prevent an attack.