Ketch Ketch A ketch is a two-masted sailing craft whose mainmast is taller than the mizzen mast (or aft-mast). The name "ketch" is derived from "catch" or fishing boat. Historically the ketch was a northern European square-rigged vessel, often a freighter or fishing boat, particularly in the Baltic and North seas. Nowadays, a ketch tends to be a fore-and-aft rigged pleasure yacht, similar to a yawl; but a ketch's mizzen mast is taller and its mizzen sail is larger than a yawl's. The large fore-and-aft sail on the mainmast is the mainsail, while the sail on the mizzen mast is the
Radio masts and towers sometimes also constructed out of steel tubes. This construction type has the advantage that cables and other components can be protected from weather inside the tube and consequently the structure may look cleaner. These masts are mainly used for FM-/TV-broadcasting, but sometimes also as mast radiator. The big mast of Mühlacker transmitting station is a good example of this. A disadvantage of this mast type is that it is much more affected by winds than masts with open bodies. Several tubular guyed masts have collapsed. In the UK, the Emley Moor and Waltham TV stations masts collapsed in the 1960s.