Ref: https://www.raspberrypi.org/products/ra ... pi-zero-w/The Raspberry Pi Zero W extends the Pi Zero family. Launched at the end of February 2017, the Pi Zero W has all the functionality of the original Pi Zero, but comes with with added connectivity, consisting of:
802.11 b/g/n wireless LAN
Bluetooth 4.1
Bluetooth Low Energy (BLE)
Thanks - I read the spec. 802.11n can operate on both bands. I think i will go with an upgraded 2.4GHz access point first and see how that goes - I've a spare router I can use.
I've got a shim and the official Raspberry Pi wifi dongle on a Pi Zero at the moment. (The W wasn't out when I built it). I'm going to try upgrading the access point first, as I've found the range of 5GHz wifi quite poor compared to 2.4GHz. The distances involved are not huge, but I would have to buy a new wifi dongle for 5GHz, so I'm trying to avoid doing so it if don't have to