Hardware to connect to commercial hotspot?

Hi, I'm trying to connect my home to a (commercial) wifi hotspot about 500 yards away from my house. Using just a dongle I can see the network with a signal strength of about -90 to -85 dBi but it's too weak to connect so I'm thinking of buying this 24 dBi antenna to put on the roof: TP-Link TL-ANT2424B. (sorry i can't post links)

My question is what do I connect the antenna to? A repeater or accesspoint or bridge? I have a Dlink 655 wireless router that connects my laptops to my desktops in the house but I'm not sure what kind of infrastructure I need to connect everything to the hotspot. Can I hook up the antenna to one of the 3 antenna ports on the router? Or do I buy a separate access point for the antenna and then just connect the lan output of the AP to the wan port on the dlink router?

I'm not sure what would be best and would that even work? Is the resulting -65dBi strong enough for a signal?

Thanks for any advice.

Please forgive if this is "too basic" or otherwise beat to death elsewhere, but I just cannot seem to find the answers I need no matter how or where I look!

In short, I would like to know how to add an external yagi antenna to my existing home wifi network, and use that antenna to access a nearby public hotspot as an "alternate" along with my current internet gateway.

I already have an antenna and enough LMR400 to get that part setup, but I'm not sure what additional hardware I will need to do this.

My current home network consists of a primary XP Pro desktop computer wired to a LAN port on a WRT54G router (now running Tomato v1.28). The router's WAN port is wired to a cable modem. Then, 2 additional desktops, a laptop, an iphone 4, and an ipad2 all connect wirelessly to the WRT54G for ICS and network shares.

So far this setup is running well for me with mostly decent (but sometimes varying) signal strength and througput in most areas of the house.

However, my town has recently partnered with Google to provide several free hotspots in our area, and one of these new hotspots has a freshly installed access antenna that is within about 200 yards of my backyard (perfectly clear line-of-sight, too!).

Well... this "free" internet access opportunity is a bit hard to just ignore; and, if nothing else, I think that getting setup for access to the hotspot as at least a "back-up" would be a wise move.

So...with that said...I would greatly appreciate any help the group can provide to answer these questions:

1. What equipment do I need to establish a connection to the hotspot through my yagi antenna?
2. What equipment do I need to tie the hotspot connection (from the yagi antenna) to my existing network, and make the hotspot available as an alternate gateway to the internet?
3. How do I go about configuring the hardware/software required to do this?

(BTW - I also have a currently unused 3Com wireless AP available, if that could help me somehow).

Many Thanks in advance to all who offer help!!!!

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