My XBEE S3 PRO loses some packets when transmitting 800 meters away from the XBEE Pair. Even though we used a 7 dbi car antenna with sma jack. we used a jack converter from sma to rp sma (if that counts) since xbee has a rp sma connector. do we need a higher dbi antenna? or is 7 dbi just enough? we are unsure if should we change parts (antenna) or there is some problem that we do not know about.