I am using the provided antennas right now. Right now on Airtel, It latches on to Band 1 or 3 or 40 or 3+40. 40A-40A support has not yet been added. There is a thread for it in
TP-Link forums
here. Hopefully after this, Speeds will improve further.
Right now on average, I get 40-50mbit. At night after around 23-00 hours, It goes as high as 90-100mbit and stays that way until 5am. Around 2130-2300, It goes down to 10-15mbit. This is all on 3+40. On other bands, It's usually worse.
I have purchased 12dbi LPDA antennas, Really excited to try those out, Should be here by the end of this week. And those antennas should improve the performance further.