TC and cable router/modem - virgin

Hi. Feeling bit thick about this. I purchsed a TC which I used to replace the router part of the cable modem + router that I had from virgin . It workede fine, and I could use it as time machine for my imac plus was better wifi signal than router provided (for iphone and husbands macbook). Then Virgin replaced old system with a combined cable modem + router (hub). So far , the only way Ive got everything working is to physically plug the TC into the virgin box. Is this the only way, or should I be able to use it connected thruough wifi? If so, how? Also, due to house structure signal is low in front of house. Is there any way I can use what I already have to get better signal or would I need to buy another airport to add to Network?

Then Virgin replaced old system with a combined cable modem + router (hub). So far , the only way Ive got everything working is to physically plug the TC into the virgin box. Is this the only way, or should I be able to use it connected thruough wifi? If so, how? Also, due to house structure signal is low in front of house. Is there any way I can use what I already have to get better signal or would I need to buy another airport to add to Network?
Cable companies always do this.. why cannot understand that a pure modem is far more useful to most users.
Anyway unless you can bridge out the router in the new combined box you will need to accept it as being the main router.. which means you should bridge the TC.
And yes, the only really effective way to connect is with ethernet. You cannot use wireless and then have to the TC extend the wireless signal.. to do that you will need another apple router.. eg express.
If you get poor signal on the existing setup, whereas you had good signal on your old router, you could reuse the old router as a WAP. I am probably adding more complexity to the system than you want though.
How is wireless on the new virgin router?
Could you use long ethernet cable to place the TC in another room closer to the dark zone. where wireless is weak. Frankly the TC does not have the greatest wireless and do need to be close to the clients or reinforced with express in extend wireless.

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