PURPOSE: To install an antenna for GPS or the like efficiently at an optional height with a compact support structure with a light weight and excellent carrying performance.

CONSTITUTION: A case 1 is formed to be set through vertically with a throughhole provided to its upper plate and its bottom plate and a couple of rubber rollers are arranged in the inside of the case 1 at positions symmetrical in the forward and backward directions with a center axis of the throughhole inbetween. An elevator is formed so that a support 71 is elevated/descended in cooperation with other rubber roller via a gear by driving one rubber roller manually or with motor-drive and extension pipes 81-85 connected to the support 71 are sequentially lifted up. Then a levelling base is fitted to a tripod and alignment and levelling are implemented, the levelling base is removed and the elevator is set, the support 71 is inserted and the extension pipes 81-85 are connected to the lower end and an antenna 61 is lifted up to a required height. Then stay ropes 92, 94 are stretched and fixed to the aligned position.