I think somebody has already mentioned the idea of a remote weather staton with no road access. However, there are some locations I have seen where telecoms relay/repeater stations are situated in very remote locations. Generally these are placed as high as possible in the area and often have "road" access - i.e. they are accesible by land transport albeit with some difficulty.
Such telecoms relays, or repeater stations, are powered by solar cells which charge a large array of batteries. From time to time the batteries have to be checked, replaced and or topped-up etc. Where time permits this is conducted by land transport but where speed is of the essence a helicopter is often used. Hazardous liquids, including batteries, are usually underslung to the location after the ground support team has been flown in first.
The helipad for these sites is usually very basic with little more than a windsock and some basic ground markings to provide the pilot with "useful" information. The ground support team would carry an airband transceiver to communicate with the pilots.