Mikrotik hap ac2 antenna mod

I recently changed to the Mikrotik hap ac2 router and I'm quite happy with it despite of its limited wifi range :confused: It has no external antennas.

So I searched for a wifi antenna mod in the mikrotik forums and found this:

Since people reported way better wifi range and speed I went and bought the fitting adapter cables, hooked them up and just connected 2 antennas from my old Linksys Wrt1900acs router....
aaand.. was dissapointed to see that wifi range and speed is actually lower with the antennas attached vs no antennas :frowning:
These are the adapters I bought: https://www.ebay.at/itm/185052478425

But I don't want to give up on this that fast so I want to ask a wifi expert here:

  • Are there any specific wifi settings I should change in openwrt when using external antennas?
  • Could the antennas from the Linksys router be the culprit here? They are dual channel antennas for both 2,4 and 4 ghz signal so I thought they will be alright. Should I buy different ones, if yes which ones are recommended?
  • At last, any other considerations to this, is it a complete waste of time in the first place or is there a chance to extend wifi range and speed?

Quite difficult to evaluate, without actually seeing the pictures (hidden for anonymous guests on the mikrotik forum) of your device, but signal propagation and antenna design at 2.4/ 5/ 6 GHz are not easy, almost like black magic. half a millimetre copper lane here, a solder drop there can make massive differences.

No problem, here's the backside of the router, I circled the connectors

These are the antennas I tried: https://www.newegg.com/p/2VT-006A-00029

The adapter cables are 10cm long, I cannot install shorter ones.

Those are not U.FL connectors, but Murata test points, used for calibration purposes in production (non-locking).

Yes, that's why I bought these adapters https://www.ebay.at/itm/185052478425
not u-fl ones.

Any ideas/input from others concerning this topic?
The fact that others successfully extended their wifi range leads me to think it should be possible somehow.
Or maybe sb knows a better place to ask then here in this section?