We present neutral hydrogen ( HI ) imaging observations with the Westerbork Synthesis Radio Telescope of AGC198606 , an HI cloud discovered in the ALFALFA 21cm survey . This object is of particular note as it is located 16 km s ^ { -1 } and 1 ^ { \circ } .2 from the gas-bearing ultra-faint dwarf galaxy Leo T while having a similar HI linewidth and approximately twice the flux density . The HI imaging observations reveal a smooth , undisturbed HI morphology with a full extent of 23 ^ { \prime } \times 16 ^ { \prime } at the 5 \times 10 ^ { 18 } atoms cm ^ { -2 } level . The velocity field of AGC198606 shows ordered motion with a gradient of \sim 25 km s ^ { -1 } across \sim 20 ^ { \prime } . The global velocity dispersion is 9.3 km s ^ { -1 } with no evidence for a narrow spectral component . No optical counterpart to AGC198606 is detected . The distance to AGC198606 is unknown , and we consider several different scenarios : physical association with Leo T , a minihalo at a distance of \sim 150 kpc based on the models of , and a cloud in the Galactic halo . At a distance of 420 kpc , AGC198606 would have an HI mass of 6.2 \times 10 ^ { 5 } M _ { \odot } , an HI radius of 1.4 kpc , and a dynamical mass within the HI extent of 1.5 \times 10 ^ { 8 } M _ { \odot } .