These tripods are very sturdy and have multiple uses. They can be used as supports for off-air VHF/UHF antennas and they can be used as supports for satellite antennas. The tripods can be permanently bolted to building surfaces or even concrete with the proper anchor bolts which you provide. The tripods collapse to a bundle that can be stowed in RVs or even carried in passenger vehicles if a portable antenna stand is needed in a mobile application. We highly recommend that a sealing material is used under the feet if the tripod is mounted on a roof surface. We suggest that you use a flexible sealing pad material that will prevent roof leaks.