Like if I have 1920 height 1080 width display, how many pixels is the ad banner?
All is explained with a simple search on Google : Banner Ads | Android | Google Developers
Cheers!
Aah, when I tried to look it up in google I was searching “Adbanner ue4 size” and couldn’t find it, didn’t think to search outside of ue4, since I thought it was determined by ue4 and not by google 
Anyhow, thanks a lot, I still needed this! 
Edit: Though I’m not sure which one of the options ue4 uses, since there’s so many listed on that site 
Ad banner size depends on clients news visible area and is defined by professionals. Now ad banner size mostly as-
Standard Web Banners [TABLE]
Size Style Gif Weight
468 x 60
Full Banner
20 KB
728 x 90
Leaderboard
25 KB
336 x 280
Square
25 KB
300 x 250
Square
25 KB
What’s ‘clients news visible area’?