A link loss calculator will be of use.
Partial list of need to knows:

What is the tx/rx unit used?
What TX power and what receive sensitivity.
What are the "remotes" specs?
How high is antenna above surrounding ground?
What is building construction if aerial indoors.
Cable used: Type, length, loss per unit length?
Connectors: Quantity, losses?
.... ?

Mr Garglabet says:  http://bit.ly/google_wifilinkloss



This is simple to use but seems reasonable.

             http://www.radiolabs.com/stations/wifi_calc.html

Also

http://store.freenet-antennas.com/linkbudget.php

http://www.swisswireless.org/wlan_calc_en.html

http://www.tranzeo.com/allowed/Tranzeo_Link_Budget_Whitepaper.pdf

....



Russell



On 11 October 2017 at 03:52, Peter Q. <btoven66@gmail.com> wrote:

> Hi there, I am going to buy an outdoor antenna wifi 2.4 ghz
> omni-directional, so what is recommended for you? Experience please; tips=
,
> brands.
>
> And what's else?
>
>
> Thanks in advance.
> --
> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>
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