there is a vhf station on a hill which is abt 0.5km from my office. I would like to know whether there is any effects of this vhf station to human body in long term. pls advise.
you are pretty far away (the signal power dies out at a high rate with distance), and the antenna pattern would concentrate the energy approximately 300 feet above your head, not down on the ground where you are. In addition, VHF is a low frequency, and does not interact with your body very efficiently. You are fine.
0.5 km is pretty far distance for a transmission to affect the human body even if it does. Frankly speaking i sit in a room of 20 x20 feet with 100 watts of HF power and 50 watts of VHF transmitters all in a hand reaching distance....I am still healthy and well....Cheers