You need a device that supports WDS and I don't think the Belkin device does.
WDS is flakey as the "standard" isnt, I believe, actually part of the WiFi alliance certification.
The Home Hub definitely does WDS - either get another HH (same version) or ditch the HH and get two devices from the same manufacturer (ideally the same model).
Remember that you will have connected through two wireless devices if you are connected via the remote device (switching between them should be automatic!) which will increase latency and limit bandwidth as the same channel is used for both devices.
Ex <n>ildram , been to SKY MAX - 15,225 Download
BE Unlimited - 21,000 Download 1,200 Upload ON THE LINE THAT SKY COULD ONLY PROVIDE 15,255 DOWN AND 800 UP ON!!!,
Moved house, now BE Unlimited 6,500 Down, 1Mb/s up - gutted!
FTTC Cab installation commenced 12th April - expect full 80 / 20 - bye bye BE, hello BT Infinity soon!