Second revision of PCBs received and soldered. Range improved. Rough tests on cloudy weather showed nearly 10m (30ft). Must wait for summer to test in direct sunlight. Bare LCDs proved to be very difficult to drive directly (no LCD driver in STM32 at least for this kind of display). Although display works as you can see on the image somewhere in the image gallery, but there is signifficant ghosting going on when seen from angle.