Understanding Wireless Antenna

Modifying antenna for Network Wi-Fi actually is  so too easy for me, why am I say such, previously lets we few the past. Antenna who is utilized divides client usually is antenna parabolic one why such, since antenna parabolic have radiation or bounce pattern as big as 90 - 120 degrees. So wireless sinyal radiation or wave of that antenna gets to reach distance that adequately goes away.

Any other thing on wireless signal transmitting that used sektoral antenna or antenna omni, that have signal sector energy as big as 180 - 360 degrees. So wireless signal that is emitted not necessarily again is led to client. 

Therefore studies and understand that on needed receiver part is parabola antenna be not sektoral or antenna omni, there are many person which look on that thing is good, up to they external antenna, therefore they look on that thing are ordinary.

For example, often I see someone play internet at public place commoning to use notebook with additional external omni that relative. With that expectation by use of antenna external it can get best wireless signal. 

That thing I say adverse, since it lovely crossbeam if it makes / modify that laptop's antenna alone as antenna which have vicinity polarization 90 - 120 degrees as tin cantenna. And stays behind to be presented at by that wireless transmitting get Wi Fi's signal the better again.

So which antenna that good for client, and which antenna that lovely for transmitter.
For better Network Wi-Fi.