Hi Again Garry, Personally I would not bother as board is laid out for the HiRose u.fl - not sure on the ground lands and placement on edge of the board (to side of the ufl) whether a straight on SMA would work effectively, however, the risk of damage and mismatch (plus void warranty!) not worth the potential reward - you might gain 0.1-0.5db through change but a bad implementation could cost as much or poss loose you the board! Note I dont know what your expectations are but both that and the 831 are SX1301 designs and very similar from RF /Baseband performance perspective other than the physicals and heatsinking etc. so you wont gain much with the change I dont expect. (IIRC the 2245 is a dual SAW implementation which will carry its own insertion loss so little/no improvement in RSSI sensitivity (again IIRC), though you might see some improvement in proximity bands from adjacent noise reduction and hence a marginal SNR improvement? Indecernable in most installs I suspect!). My pref would be a very short pigtail to get from ufl to SMA asap, pref even go ufl to N-Type in short order. Then if you want to gain a little I would improve the ant feed - dont know what you are using right now but at 5m worth spending a little to improve - e.g. look at some of the Aircell ultra-low loss cables or equivalents - I’ve had custom cables made up in the past for SMA (smaller gauge Aircell - good for 3-8/10m) or N-Types (thicker gauge => lower loss) with good results for 5,7 10, 12 and even 15m runs. Note: if you do risk change be sure to solder the SMA on both sides of PCB as helps with strain relief (another advantage of using a flexi pigtail of the ufl) esp if connecting directly to a ‘strong’ cable type. A lot of manufacturers often solder 2 of the 4 SMA corner posts only on one side and I’m afraid I include RAK in this (have had RAK5205 SMA field failures in high stress use cases as a result!). C/w cable losses the local connector losses and reflections will likley be small … and what the hell you already hear Wales! (Remember the wider/further you can hear the higher your contributed noise floor and potentially reduced/impaired SNR capabilities)