Antennas don't care about transmitting radios at 2.4 or 5 GHz frequency. The frequency reception and broadcast all depends on the WiFi chip. The purpose of connecting multiple antennas is to use MIMO that doubles the speed of a SISO (i.e. one antenna setup). FYI, Intel 7260 can detect 2.4 and 5 GHz simultaneously BUT NOT CONNECT to both frequencies simultaneously. Some wireless routers use the same antennas for their 2.4 GHz and 5 GHz radios.
Thanks for the insight, i got this mini wifi module for my itx board, and as i saw (for the first time) 2 connectors and and 2 band in specs i was immediately confused without any background in radio and googled all the wrong keywords.
Also when i was looking for antenna , most of them was spec'd as 2.4Ghz and so my confusion was where are 5Ghz antennas .
I looked at this antenna Ghz in a wrong way, so 2.4Ghz antenna does'nt mean it is only suitable for this frequency , conductor makes a difference so conductor used for 2.4Ghz frequency is as good for 5Ghz.
2.4 GHz is the most common frequency. The only way you can harm the antenna is to load it with extremely high transmit power, but you'll probably burn your radio chip inside the WiFi card before you do damage to antennas. Conductor makes a huge difference in range and speed and not as much as frequency.
Here's how MIMO works: How Stuff Works – 802.11n MIMO | WiFi Jedi.com
BTW, it all depends on radio chip if it supports 2.4 and 5 GHz and not the antenna specs. It's actually the antenna GAIN that you're supposed to look for and how much antennas needed by the WiFi chip to perform to its optimum speed.
The answer is just wrong. The antenna needs to support 5GHz. (802.11 (a/b/g/n/ac/ad): 2400-2483.5 and 4900-5875 MHz antenna)
Reference: FCC compliance documents