Pretty simple. 4.5 dBi antenna: Paradar 868Mhz LoRa antenna, weatherproof for harsh outdoor environments, for HNT, LoRaWAN, amateur radio, and aviation - 4.5dBi https://www.amazon.co.uk/dp/B08X2VYW7F/ref=cm_sw_r_cp_api_glt_fabc_BPG3Z8GSGSZ2N46TZTGN?_encoding=UTF8&psc=1 and a decent quality cable: N-Type to RP-SMA Male Extension Cable 3 Metre Lead Low Loss HDF400 Antenna WiFi Part No | XEX-3M-SMA-N-TY it probably needs some more tinkering to tune everything in, but so far it’s exceeded my expectations.