Roxio wireless bridge ethernet

Hello,
i have a sharp led hdtv that has an ethernet jack to receive the internet. it is not one of the wifi-ready but does have aquosnet and netflix loaded. i would like to receive the net. i called sharp and they told me that i need a wireless bridge ethernet to capture freely-accessible (i don't have a service providor for broadband, nor can i afford one though i do live near central park on a high floor with some sky space visible outide my window. he said roxio or linksys or belkin carry such a device. i have a laptop as well and AM GETTING THREE TO FOUR BARS AT BEST. WOULD I NEED TO CONNECT SOME GIZMO TOM Y LAPTOP--AN HP G7 PAVILLION 1070US NOTEBOOOK TO THEN TRANSMIT TO THE BRIDGE OR IS THERE A SMART WIFI BRIDGE MODEL I CAN USE THAT WILL PULL NET ACCESS OUT OF THE SKY AND BRING IT INTO MY SHARP LED HDTV VIA THE ETHERNET CABLE AND IF SO, WHICH MODEL IS BEST, HOW TO SET IT UP AND WHAT DO I NEED TO DO?