also typically guyed masts. Additionally guyed tower An additionally guyed tower is a free-standing tower, which is also additionally guyed. An additional guying can be temporarily or permanent. Temporarily additional guying is used when work on static relevant parts of the tower is done. A permanent guying is attached when the construction has to withstand strong forces in a certain direction – for example, some types of electricity pylon where the conductors change their direction or terminate. Towers carrying horizontally spun wire antennas are sometimes additionally guyed. Sometimes towers in windy areas are additionally guyed in order to withstand increased strain. The main advantage of additional guying is that it is cheaper than building a completely free-standing tower, which can withstand the same force. Furthermore, it allows for very easy upgrading of existing structures. The disadvantage of additional guying is that it requires much more ground space and that the guy basements handicap the work of agriculture. There is also a danger that the guys can be damaged at their basement anchors, so the basements need to be fenced in. Partially guyed tower A partially guyed tower is a tower structure which consists of a free-standing basement, in most cases of concrete or of lattice steel, with a guyed mast on the top. The anchor basements of the guyed mast can be on the top of the tower or on the ground. Use Partially guyed towers are typically used when a very high tower for FM and TV transmission is required, while also carrying antennas for directional radio services at a much lower height. In such cases the antennas for directional radio services are mounted on the top of the free-standing part of the tower, while the guyed mast on its top carry the FM and TV antennas. They can be also used in order to upgrade small stable towers (like watertowers) with a long antenna mast for FM and TV broadcasting. However their use is rare, and they exist chiefly in certain European countries. Note that mast radiators which stand atop an antenna tuning hut ( helix building) are not considered partially guyed towers, because the hut is much smaller than the mast radiator. Such constructions include the Mühlacker radio transmitter and the Ismaning radio transmitter. Anchor placements Partially guyed towers can be divided into two types, depending on the placement of the guy anchors. Anchors atop the free-standing