Keith, I saw your recent comment about your WikiTree+ query for:
https://plus.wikitree.com/default.htm?report=srch1&Query=R-S221&MaxProfiles=500&Format=
I don't think you did anything wrong with the search. However, I don't believe that query is actually searching for a haplogroup entered in conjunction with a DNA test. Rather, it's a text search and most of what it's returning has been entered as a Category on the profile or in text, including source citations, in the biography box. Two examples that are returned from the "I-M223" search:
https://www.wikitree.com/wiki/Polk-1876: the profile has an assigned Category of "Y-DNA Haplogroup I-M223," but the haplogroup shown in conjunction with the DNA test taken is "BY193625," a deep subclade of I-M223.
https://www.wikitree.com/wiki/Kenneally-196: this profile is returned by the query only because of this this citation #25: "'United States Census, 1910', database with images, (FamilySearch Record: M223-X35..."
The Help page for WikiTree+ indicates that there should be a way to perform the search you need (see the index entry for DNA), but none of the various combinations I've tried result in accurate output.
If you add the "data_doctors" tag to your question you'll be more likely to catch the eye of Aleš--the ultimate authority--or at least someone much more fluent in WikiTree+ queries than I am.
A final note is that any search for yDNA haplogroups may prove to be only nominally useful for you...even if the results returned are 100% accurate. The main issue is the size of the yDNA haplotree. You can find a little background on the subject in this G2G post from 10 days ago.
Your basal R haplogroup currently makes up 47.7% of all 76,932 branches, or subclades, in the haplotree. The most common haplogroup, SNP M269 (R1b1a1b in the older style naming convention), sits 7 branches down from the top, R-M207. People who have taken a Big Y test or had their whole genome sequencing results analyzed by a company like YFull will enter their deepest-known SNP designation into WikiTree, and that could be an additional 20 branches, or more, farther down. The complexity means that two test-takers could have consistent haplogroups, but if they are entered into WikiTree as a valid subclade, but one higher or lower than yours, a literal query for your haplogroup wouldn't find them.
The other difficulty you face is that the SNP Living DNA reported for your yDNA haplogroup is not one that Family Tree DNA--still the 800-pound gorilla in yDNA testing--catalogs in its haplotree. So even if the WikiTree+ query works as expected, you'd have a very small chance that someone had entered S221 in the DNA test results panel: a query for that SNP would be unlikely to be well-represented in the search results; Living DNA has the smallest database of the five largest (by test volume) DNA testing companies.
Doing a little quick research, SNP S221 would be, under the GRCh38 assembly that is universally used for yDNA data, position number 8,849,155 on the chromosome. If you're interested, at the dbSNP database of the National Center for Biotechnology Information, it's cataloged under the rsID of rs767265794.
At FTDNA, that position on the chromosome is represented by R-Z284 (https://www.familytreedna.com/public/y-dna-haplotree/R;name=R-Z284). That is an R1a rather than an R1b subclade; in the older naming convention it would be R1a1a1b1a3a. It's 11 branches deep in the basal R clade and currently has another 1,374 branches under it.
Probably the most likely higher subclade you'll see reported from FTDNA's standard STR tests (short tandem repeat; the 37-, 67-, and 111-marker tests that can be purchased less expensively than the Big Y) is going to be R-M417. In the older naming convention, that's R1a1a1.
But your "terminal" haplogroup will fall under one of four main subbranches of R-Z284: these are designated by the SNPs YP556, S4458, YP1370, and Z288, with S4458 having the lion's share of the deeper branches, 903 of them.
Good luck in the research! 
