A standoff detector is required to reduce the damage caused by explosive objects such as landmine and improvised explosive devices (IEDs). A forward looking ground penetrating radar (FLGPR) has the benefit of detecting buried objects at a significant standoff distance. We fabricated a vehicle-mounted FLGPR comprising 4 × 32 multiple-input multiple-output (MIMO) radar antennas, and then conducted a field test for the detection of buried landmines and projectiles. Here we show that the FLGPR system with LS-band succeeded in detecting the buried landmines and projectiles during vehicle running. We found that the LS-band radar was able to detect the buried landmines and projectiles while the vehicle was running by using motion compensation and multi-look processing. The experimental results suggest that the LS-band can be available for standoff detection with a vehicle-mounted FLGPR system.