kamerapengintai

Hi, i have a project to install 4 speed dome and 4 fixed camera for a vacant land, the land is about 2000 feetx1000 feet (600mx300m), and it must be transmit to the office, across the road, the road is about 10-20m. there is no cable can go under or upper the road. so all camera must be transmit too the DVR. This camera is used to monitor the construction of a new building in that vacant land. I'm very new to CCTV instalation, - Please any advice to transmit camera to the DVR, did i must use NVR/IP based? balun? - There is no internet on the spot. Only power and pole to place the camera. - How to measure 30x zoom maximum range in feet. please see the picture attach. Thanks, Victor