Quote:
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Ordinarily most operators prefer to install WiFi access points above ground, not least because it helps the 2.4GHz signal to propagate, but telecoms infrastructure owners like Virgin Media have a lot of manholes around the place that can also be used (makes it easier to tap directly into their core capacity links) and apparently this approach can still cover an area of up to 80 metres.
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Source:
http://www.ispreview.co.uk/index.php...n-chesham.html
inb4 qasi complains about the stupidity of placing the wifi underground :P