11. At these glancing angles, electromagnetic fields and radiation patterns are the same as for a half-wave dipole . 12. The individual elements are most commonly half wave dipoles , although they sometimes contain parasitic elements as well as driven elements. 13. Quarter-wave monopole antennas ( 144 and 435 MHz ) and half-wave dipole antenna ( 29 MHz ). 14. Therefore, the total emitted power is half the emitted power of a half-wave dipole fed with the same current. 15. In this case, two half-wave dipoles were used, located about one wavelength apart horizontally on the antenna framework. 16. The antenna consisted of 4 rows of 16 half-wave dipoles backed by a 3-by 3-meter mesh screen. 17. An array of 1056 half-wave dipoles in front of a 90 degrees corner reflector forms the primary feed of the telescope. 18. Consider a half-wave dipole designed to work with signals 1 m wavelength, meaning the antenna would be approximately 50 cm across. 19. Most antennas are at least ?of the wavelength, more commonly ?the half-wave dipole is a very common design. 20. Antenna gain can also be measured in dBd, which is gain in Decibels compared to the maximum intensity direction of a half wave dipole .
