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Hi
If you really must cover that distance a high gain directional aerial will need to be constructed.
The most gain will be had from a parabolic dish at least 2 ft (60cms old satellite aerial dish) with the USB module aerial (the plasic covered end) at the focal point supported by a rod of some sort.
Without a special cable about 5 metres will be the limit of the distance the aerial from the computer and the aerial will need to be rigidly mounted and pointed accurately at the intended (victim). A gain of about 16 db should be readily realised which over a line of site path and probably useful to about a Km.
Barry
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