The Wisycom LBNA UHF Wideband Antenna (470-870 MHz) will be available in the US soon!

Here's the basics:

• Enhances reception providing approx 6 dB gain with typical mean-width of 90 degrees
• Up to 15 dB gain Gain adjustable in 1dB steps
• Passive or active operation
• Digital display
• Weather resistant