https://devzone.nordicsemi.com/f/nordic-q-a/33337/ble-antena-directionalityHi, I can&#39;t found anything in the nrf52840 documentation about the ble antena directionality. I want to use it for indoor location, so i would like to know if it is omnidirectional or not. When i put the nrf52 vertically, i get variable RSSI resultsen-USTelligent Community 13Fri, 13 Apr 2018 06:50:27 GMThttps://devzone.nordicsemi.com/thread/128160?ContentTypeID=1Fri, 13 Apr 2018 06:50:27 GMT137ad170-7792-4731-bb38-c0d22fbe4515:58d12c9f-1678-4eb3-9517-cbc3e722d405Damien Berger<p>Yes i am using the antena board, i am not connecting any antena.<br />I use 200 RSSI samples and a filter based on standard deviation to reduce variation.</p> <p>Results i got are aceptable in three directions (left, right and front when the board is in vertical position), but not with the back direction. I should be able to estimate distance from RSSI but this direction would false the results.</p> <p>Thank you for your response.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/128131?ContentTypeID=1Thu, 12 Apr 2018 19:05:32 GMT137ad170-7792-4731-bb38-c0d22fbe4515:475226f6-ec5b-44d6-a539-08947a78991aDave_couling<p>Antenna directionality is completely dependent on your antenna design.&nbsp; This isn&#39;t really something the Nordic chip is responsible for.&nbsp; What antenna are you using?&nbsp; &nbsp;If you speaking specifically about the eval board, it is fairly omni.&nbsp; RSSI accuracy is always going have a fairly high degree variation even as the devices are stationary.&nbsp; It what +/-4dB on the nRF51.&nbsp; So you need to average many RSSI samples to filter out variation.&nbsp;&nbsp;</p> <p>RSSI will always be subject to alot of factors: multi-path, interference..etc.</p><div style="clear:both;"></div>