We have 21 SP4s and 5 APs that feed them Wireless. Problem is there is no Roaming Aggressiveness setting for the built in Marvel WiFi so the SP4s stay connected to a an AP even when it is down the haul from the user and they are currently standing underneath another. This in turn I beleive is partly causing some EHR issues due to the lower signal strength. So those of you who have moved to an External USB WiFi adapters, which brands have treated you well? I contacted ASUS chat about their USB-AC53 adapter and they said it does not have roaming aggressiveness but also told me they didn't show which chipset the adapter used.