I do experiment with an added Minicircuits PSA-5043+ and a 868MHz bandfilter. For now I’ve only seen higher RSSI levels, the C/N-values are about the same. I do use a short good quality coax, people with longer cables would probably benefit more. Down side is that I can not transmit downlink messages anymore, or else I will blow up my preamplifier.
Without a proper implementation to get statistics from the gateway I can not give any conclusive statistics yet. And it would also be nice if BEACE103 would come online again.