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Nighthawk M2 worse performance with external aerial


Nighthawk M2 worse performance with external aerial

I have a Nighthawk M2 router which has performed very well while on holiday in France as a stand alone unit. To get better performance I bought an external antenna Poynting 4G-XPOL-A0001 Cross Polarised 4G Omni LTE Antenna connected via an Eightwood SMA TS9 Antenna 4G LTE SMA Female to TS9 Male Cable and when I connected the signal strength went from -114db to -85db which was a huge improvement. But the unit became very unstable with this aerial connected and would reboot constantly or just not deliver any usable wifi.


Once I disconnected the aerial the unit would then be very stable and fast again.


Why would this be? 


Anyone have any aerial recommmenadtions for this router that are known to work well?



Model: MR2100|Mobiler Router Nighthawk M2
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