It only cost me 24p (UK) per antenna for this project, so it is nice and cheap.
My router is a Tenda model, which already has 2 aerials and a dish and only cost me £25, so I would really recommend it.
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Signing UpStep 1Materials
A Wire Skimmer (for taking food out of pans)
Pliers
Spare Aerial or stick the same diameter as your aerial
Any other metal strainer/sieve should work to :)
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http://www.powermicrowave.com/
http://www.powermicrowave.com/en/4w-en.html
http://www.powermicrowave.com/2wen/2w-en.html
It would work in a similar way to a parabolic reflectors.