You could try separating the SSID's of the 2.4 and 5 GHz wifi bands on the Hub3 and also switching off "channel optimisation" - that often helps Hub3 users get better wifi performance - but its still no substitute for better kit.
To address this, VM now supply “wifi pods” (not “boosters”). These are free to customers on the 1GB or Ultimate Oomph packages, and so are worth trying if you are on one of those. There are stock supply issues at the moment though.
Otherwise, you will be charged £5/month - and at that level of investment you would soon pay off that cost by buying a "better" wireless solution that will be yours to own and use forever
Get either a… (1) Mesh System, (2) Wireless router, (3) Wireless access point (4) A combination of (2) & (3).
-------------------- John --------------------
I do not work for VM. My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired 2 WiFi,) SH2 in modem mode with Airport Extreme Router +2 Airport Express's. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.