I just want to confirm. How many antennas does x20 have. On the official tp link site it states 2 antennas however in online shops and review sites it shows 4 antennas. So which is true?

This is from an online shop

This one is from a review

And from official tp link site

Also. Does antennas will have factor behind wall? Currently i have 4 e4 which only have 2 antennas. My bedroom in 3rd floor is only getting 2.4gj from signal source below my room. If i upgrade to x20 will i get 5ghz in my room. Thanks