11. Loop antennas are often wound with litz wire to reduce skin effect losses.12. In practical terms, erecting a horizontal loop antenna on a ship caused several problems. 13. Before 1960 navigators used movable loop antennas to locate commercial AM stations near cities. 14. Prior to Adcock's invention, engineers had been using loop antennas to achieve directional sensitivity. 15. The loop antenna and the tuning knob were also visible. 16. Its characteristics are unlike that of either sort of loop antenna described in this article. 17. Butterfly capacitors are used in symmetrical tuned circuits, e . g . magnetic loop antennas . 18. A distinctive diamond-shaped DF aerial was fitted on the cabin roof, replacing the loop antenna . 19. How big can a RuBee loop antenna be? 20. Traditional radio direction finding used a loop antenna .
