Since you appear to already be paying for internet service, the obvious, easiest, and most reliable way would be to buy your own wireless router or add a WAP to your existing system. Are you wanting to drop your ISP and tap into someone else service? If so, that may be illegal but is also very unreliable. I know that some communities have installed wifi that's available to subscribers at a cost that may be more attractive than some ISPs offer. You could check into that possibility if you wish. I don't know much about how these work but suspect they may offer less than air tight security.
Presently I am using a wired router for internet surfing etc. I am using 2 pc's and both have wireless connection capability.
I can see that there are wireless connections in my area and they are secured connections. If possible is there a way to connect wirelessly to one of these?