good morning @sunny
idea was to use a second air and give you the option of positioning with a chance of reducing localized noise , probably now your restricted because of temperature and humidity optimization i.e shade .
i also live in a city istanbul … i spent months trying various positions often at times the combi boiler would trigger , often the elevator would trigger a strike however once i found the quiet spot not only did the distance increase but the localized noise was not a factor. as i said it took months , i call it the sweet spot . hope you get a resolution for it but i guess using a single air there is the trade off as you cant position optimally for both temp and lightning 90% of the time.
having said all that i have a third air i think 2018 model that just triggers like mad no matter where i locate it so possibly not all air production models are the same in terms of manufacturers calibration.
horizontally positioned basically changes the polarization however not sure what polarization it is exactly as its impossible to measure the lobe of the coiled antenna ,could be of any be it vertical polarization, horizontal polarization or circular polarization . anyway i find the air for storm monitoring very effective and useful .
my temperature air sits in a 5 dollar (euro) diy box made up of square plastic air vents effective for temperature and allows that also to be positioned in an open space in full sunlight however if position that air 2019 at rear of property in the shade it gets many false lightning caused by the elevator.so i found its all about positioning to reduce a lower noise floor…
below shows the difference in count horizontal (h) and vertical (v)