airport express to modem and airport extreme to extend?

i changed comcast att , directv. previously, had easy set comcast since coax jack tv. set modem, cable tv receiver, , airport extreme in 1 spot , connect directly xbox 360 , tv network cables.

however, since switching att, have move modem area phone jack. problem phone jack near tv , far run network cable dtv receiver , xbox 360.

here's question. can connect airport express modem set network , use airport extreme extend network? if can extend network extreme base station , set near dtv receiver , xbox 360, can run cables extreme base station dtv receiver , xbox 360? don't want pay money buy overpriced xbox 360 wireless adapter , wireless deca adapter dtv receiver if can solve problem airport express , extreme own.

appreciated. thanks.

 

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