In 2.4 GHz range, this is not the best antenna I tested. It has a distinct proximity effect. laying close to the table the values are not bad but moderate. They get better in free space baut not extraordinary, see pictures. I can say nothing about 5GHz, that is beyond the capabilites of my measuring device. I also cannot measure the real gain (dBi). I just can measure the VSWR which is the necessary condition for a working antenna. 23 calendar / 19 working days to Germany Ordered in december 2020, arrived in jan. 2021.
Thanks, order was delivered fast, pleasant deal