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In 1895–1896 he invented the vertical monopole or Marconi antenna, which was initially a wire suspended from a tall wooden pole. He found that the higher the antenna was suspended, the further he could transmit, the first recognition of the need for height in antennas.
Large sums of money are spent by ardent bird feeders, who indulge their wild birds with a variety of bird foods and bird feeders. Over 55 million Americans over the age of 16 feed wild birds and spend more than $3 billion a year on bird food, and $800 million a year on bird feeders, bird baths, bird houses and other bird feeding accessories. [22]
As with wire feeders, this avoids the need for a mast support insulator, and also does not require an isolator in the power cables for the mast's aircraft warning lights. This construction was used in three large umbrella antennas for the obsolete Omega navigation system which operated at 10–14 kHz , to eliminate the very difficult problem of ...
Blue jay eating at a feeder Bird feeder in a garden. A birdfeeder, bird table, or tray feeder is a device placed outdoors to supply bird food to birds (bird feeding).The success of a bird feeder in attracting birds depends upon its placement and the kinds of foods offered, [1] as different species have different preferences.
Microstrip antennas have become very popular in recent decades due to their thin planar profile which can be incorporated into the surfaces of consumer products, aircraft and missiles; their ease of fabrication using printed circuit techniques; the ease of integrating the antenna on the same board with the rest of the circuit, and the ...
The pole that the lighting is mounted on is generally at least 30 m (98 ft) tall (under this height it is referred to as conventional lighting system), [1] while the lighting consists of a luminaire ring surrounding the pole with one or several independent lighting fixtures mounted around it. Most units have four, six or eight lights in the ...
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A Dayak Rumah Baluk with 5-meter-tall stilts, West Kalimantan pavilion TMII. Stilts are poles, posts or pillars used to allow a structure or building to stand at a distance above the ground or water. In flood plains, and on beaches or unstable ground, buildings are often constructed on stilts to protect them from damage by water, waves or ...
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