Direction is the shape of the transmission pattern. As the gain of a directional antenna increases, the angle of radiation usually decreases. This provides a greater coverage distance, but with a reduced coverage angle. The coverage area or radiation pattern is measured in degrees. These angles are measured in degrees and are called beamwidths.
1. (Units) Also called: long ton Brit a unit of weight equal to 2240 pounds or 1016.046909 kilograms. 2. (Units) Also called: short ton or net ton US a unit of weight equal to 2000 pounds or 907.184 kilograms. 3. (Units) Also called: metric ton or tonne a unit of weight equal to 1000 kilograms. 4. (Units) Also called: freight ton a unit of volume or weight used for charging or measuring freight in shipping.
The measurement used is actually close to the long ton (1020 kg). The tonne is hardly used in the US and the metric ton (or just ton) is used. In the States, the short ton is equal to 907.1847 kg. As you can see there is actually a difference between the two. The European tonne is equal to 2240 lbs. In the United States it is equal to 2000 lbs. In colloquial use however, ton, tonne and gigaton are interchangeable.