https://www.youtube.com/watch?v=aUYGb2JtQYA
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TP-LINK TL-ANT2409A 2.4GHZ 9DBI DIRECTIONAL OUTDOOR ANTENNA (SMA port required) https://www.e-shop.gr/tp-link-tl-ant2409a-24ghz-9dbi-directional-outdoor-antenna-p-PER.612335
TP-LINK TL-ANT2414A 2.4GHZ 14DBI DIRECTIONAL OUTDOOR ANTENNA (SMA port required) https://www.e-shop.gr/tp-link-tl-ant2409a-24ghz-9dbi-directional-outdoor-antenna-p-PER.612336
Omni Antenna vs. Directional Antenna https://www.cisco.com/c/en/us/support/docs/wireless-mobility/wireless-lan-wlan/82068-omni-vs-direct.html
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EMF Meter Radiation Detector - Tester for Laptop / Mobie Phone / WIFI Router Handheld https://www.ebay.com/sch/i.html?_nkw=wifi+radiation+meter&_sacat=0
origin - http://www.pipiscrew.com/?p=13256 extend-your-wifi-with-a-can