There is a lot of difference between different wireless routers. Ten years ago a wireless router would hardly provide access for a whole house, a modern AP like a Motorola 7131 could do a couple of streets. Outdoors they will work line of sight to over 3000 feet. I used to test them.
If you actually want to keep people out you need to use WPA2. WEP was broken years ago and can now be cracked trivially (the teen next door with a few hours and some interest). Even WPA2 can be cracked if you use a short pass phrase, like a simple word. So for serious security use a long non-english pass phrase with WPA2.
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