F1794 is to my knowledge one of a large number of phylogenetic equivalents to R-M269. The link from Twilight's post is very good as far as detailing R1b.
To explain the variant index entry a bit further:
The first column lists the tree name. It uses the same heuristic to choose a preferred name as David Poznik's yhaplo program (but the group assignment on the site uses my own algorithm that's about 3 years old now.) This makes the group assignments consistent with 23andMe's naming, but will be different from the general community in many cases.
The aliases column shows everything from yBrowse for the same location and mutation.
The coordinates should be self explanatory.
Branch(es) are all the tree blocks where the mutation has been known to occur. With more NGS results coming in we are finding many SNPs where the same mutation has developed independently.
Finally, Regions (which is blank for this example) indicates of the variant is contained in a known STR, the centromere, DYZ19, or other region that may prove problematic in the future. These result in the tree entry being color coded.
If someone is aware of an NGS test sample with 10x or better coverage showing otherwise, I'd greatly appreciate a link to the BAM. (Use the submission page on the hap group-r page.)
