Can I use TC as a wireless router with a wireless broadband and how do I set it up?

I have a roof aerial with a box attached (maybe this is a AP/CPE but I'm not sure), and there is a wireless AP router in the house connected to the cable coming from the aerial. I can use this existing router for wireless connection but it works better if I connect an ethernet cable directly to the router because the wireless capability is rubbish so the TC might be better.

QA Apple Time Capsule

QA Apple Time Capsule

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