The whole band is 5925-6425 MHz, but standard radios work up to 6100 and now I have a few channels available in that range. This is out of spec for antennas designed for 5 GHz, and some work better than others. I did some tests to compare SXT 5ac with SXT HG5ac, and the lower gain version seems to work better (it seems the HG antenna trades high gain for narrow frequency response, which is understandable given limited physical size; I see something similar with competitors radios where old LocoM5 or NSM5 seem to work better at 6 GHz than NBE-M5-19).
How about larger integrated 802.11ac devices for longer distances? What is better: QRT 5ac, DynaDish, or do I really need to use a NetMetal with a separate wideband dish (they exist, but are more expensive)?
BTW, there are converters that would make it possible to cover the whole band - http://www.doodlelabs.com/products/prism-fes/ - but that company says they only work with large customers, and apparently I’m not large enough for them to sell me their product. Could someone larger than me (MikroTik?) try to work with them to make it possible to buy these converters and make nice 5925-6425 MHz “ac” radios? Existing radios for that band are still “n” only, and either very expensive or non-CE-certified (only available in Russia). Since such a converter is not a complete radio, when sold as an electronic component it doesn’t have to be CE-certified (whoever uses it connected to the antenna is responsible for certification). Large parts of that band have recently been freed here in Poland by a large mobile carrier formerly using them for long distance PtP links, and now that would be a good option to escape from the crowded 5 GHz.