[SOLVED] what's the diffrence in these antennas

[white.a.drew]

Hello everyone today I was looking at new antenna's for my wifi card and router in total I need 8, 4 for my card and 4 for the router.
However looking at the antennas I was noticing some day 7" long 12dbi, 8.5" long 16dbi, and even 6" and 17" 22dbi. What's the difference in these antennas?

 

[kanewolf]

Unknown. Aftermarket antennas have no validation of their performance. The sellers can claim anything. There is no way to know what the performance of any of those antennas is.

 

[white.a.drew]

Unknown. Aftermarket antennas have no validation of their performance. The sellers can claim anything. There is no way to know what the performance of any of those antennas is.

Thank you