UH-1V is a modified UH-1H equipped with radio altimeter, DME, glide slope indicator, and hoist. According to the references I have available it was an "unofficial" designation given to the modified H models. The first unit to receive the UH-1V was the 397th Aeromedical Detachment of the New Hampshire National Guard. I doubt that there were any obvious external differences. In the one photo I have seen the only odd bit I can see is an antenna on the roof with a forward rake of approximately 30 degrees with a "whip" trailing aft parallel to the cabin roof. The hoist is probably a factory installed job
(photo on p. 32 Squadron Signal In Action # 75). Tail # NHNG over 0-01864. Three position air ambulance marking on cargo doors and nose with 397TH at junction of
red cross arms. Full color National Guard emblem on pilots' doors. Yellow skid steps.
Wish there were more. Good luck.
As an afterthought, you may want to write to Bell Helicopter/Textron and request a Product Reference Guide. I got one years ago and it is loaded with a wealth
of photos that detail bolt on equipment.
Don't mean nothin'