Message posted by Mark Lincoln on July 26, 2011 at 6:58:59 PST:

Ever hear of Chain Home? Some early radars worked at quite low frequencies.

Essentially all one is trying to detect is a presence affecting the reception.

Anyone who lived in the boondocks during the era of VHF analog TV has seen the effects of aircraft between the transmitter and receiver.

One would need a pretty high-gain antenna.

In Reply to: Re: Anyone recognize patterns in Janet flights? posted by Gordy on July 25, 2011 at 22:47:26 PST:

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