G5 tower operate with no antenna?

I bought a used dual processor G5 and recently installed an airport extreme card. I did not, however, have the external T antenna. I tried the airport card anyway and for some reason the computer showed full reception, despite not having an antenna. It recognized my wireless network and I was able to login, BUT I cannot actually communicate with the internet and I cannot access my router by typing in the router address in my browser window. I can do both of these with my powerbooks. My question is: is the inability to connect to the internet most likely due to me not having an antenna or is there some other software issue? I tried troubleshooting the software configuration already, but maybe I'm missing something. If it shows full signal strength, do I still need to get an antenna?
Thanks.
Ben

BennyM-
Interesting. I haven't heard of folks having good signal strength without an antenna on a G5 unless the router was sitting right next to it. I think you need to get an antenna.
Are you able to access the internet via plugging a cable between the Mac's ethernet connection and the router?
Luck-
-DaddyPaycheck

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To determine the required height of an antenna tower over a hypothetically flat, spherical Earth, it's necessary to calculate the effect of the Earth's curvature, and then add a distance equal to 60% of the radius of the First Fresnel Zone. The table below shows the result of these calculations. Values have been rounded up to the nearest foot.
Line of Sight Distance Between Antenna Towers
Height of Tower to Avoid Flat Earth Curvature
Tower Height Required Over Tallest Obstacle In Line-of-Sight to Provide
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2.4GHz 802.11b/g
5.8 GHz 802.11a
8 Miles
10 feet
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25
10 Miles
15 feet
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30
12 Miles
20 feet
43
35
14 Miles
25 feet
48
40
16 Miles
30 feet
53
45
18 Miles
40 feet
63
55
20 Miles
50 feet
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65
22 Miles
60 feet
83
75
24 Miles
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93
85
26 Miles
80 feet
103
95
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123
115
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125 feet
148
140
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173
165
40 Miles
200 feet
223
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G5 tower operate with no antenna?

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