use pc to check.. check the unifi air area in unifi website..

https://unifi.com.my/personal/home/wireless-broadband

then, use google map, and measure the distance from ur location to the last edge of the blue area.. if not more than 3.5km, then probability for u to get unifi air coverage is around 70-80% and u might need to use outdoor antenna for signal stability.. if distance is more than 3.5km, then pray that there is band40 in ur area but not yet updated by tm.. as what i heard from my friend , tm do not plan to expand their unifi air coverage further, instead they are now working to roll out their 5g sa and concentrate on it instead..