Testing biquad antenna, perfect picture over 4 km

After 2km flight with omni antennas, I've decided to make biquad antenna described by IBCrazy. It impressed me how good this antenna is. I had no video reception problems what so ever for the whole 4km flight.

RSSI level shown by OSD is not calibrated, so it show no RC control, even I had a solid control and no failsafe's.

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