У вашего броузера проблема в совместимости с HTML5
I'm testing my homemade, three element yagi antenna on 28.5 MHz. The Gamma Match is made of a mobile-antenna socket with an 3/8 Inch (hy-gain) rod. The directors are made of six shorted radials of an old 27MHz, 1/4 GP antenna by LEM. The boom is made of a 2x2cm ALU-tube.
Equipment: YAESU FT-920 with G-250 rotator, antenna analyzer by VECTRONICS: (SWR-584B)