How many ML-2452-HPAG5A8-01 antennas for AP510E is the ideal setup

[oxoyoz]

My AP510E currently has 8 ML-2452-APA2-01 antennas installed. I am using both radio1 and radio2 at 5Ghz band and my antenna setup is 4X4. 
I plan to replace my antennas with ML-2452-HPAG5A8-01, with the goal to extend signal reception area a bit (I am aware of the trade-offs by using high gain antennas.)
My question is, shall I replace all 8 antennas, or can I get by just by replacing those transmitting WiFi signals?
If the latter, which antenna IDs (1-4 for radio1, and 5-8 for radio2) shall I replace? 
Thanks for your help.

[Christoph_S]

Hello,

Ideally all connectors should be used, but you have other options as well. To determine this, SSH into the AP and run the following commands:
#self
#int radio 2
#antenna-mode ?

You'll see the following:

​BR​​