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hi I see the author is a ari g fan
2.4 GHz is on the high end of the radio frequencies and the 5 GHz is on the very high radio to low microwave frequencies. If you want to block electromagnetic frequencies(Wifi) , use bodies of water. The only thing that can get through them is extremely low frequencies (ELF) which broadcasts at about 1 hertz, nowhere near 2.4 gigahertz. ELF is what navy subs use to communicate with others.
An interesting study on cress seedlings was done by 9th grade Danish students. The experiment was repeated by a young Michigan boy, Aiden Fitchett, an article in TriCity Times. You also might want to take a look at the recent studies at the BioInitiative Report 2012.
One of the problems "proving" wireless signals are biologically harmful is "replication" of effects. The problem is genetics of plants/cells/animals vary, as do human weaknesses and strengths. Some people can smoke all their lives and never get cancer, while others get cancer from 2nd hand smoke...just to help understand radiofrequency radiation risks.
To understand the science and how people treat the science on RF see at YouTube Dr. Ted Litovitz giving a talk to U.S. Congress in 2001. It will help to understand the controversy and what it means to take no precautions.
Interestingly, recently the CDC actually issued a stronger warning of RF from cell phones, esp. for children, and then it flip-flopped and RETRACTED it. Within a few days. There is much political pressure to not find any harm, and to not acknowledge biological damaging impacts, sad to say. Fascinating topic.
Tetrapak Easy Radio-Frequency body protection box
Smart-Meter radiation shield
Lion of Love
10 $ WIFI 16dBi Super Antenna Pictorial
a quick, dirty, and effective reflector for the lab network
Parabolic WiFi signal deflectors
WiFi range expander on wireless repeater Linksys WRE54G
A subtle yet over-kill Wifi Antenna Hack
Reginald: a UDP surveillance bot; control via the Internet
Posted:Mar 13, 2011
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