(Revised)
According to this site ( : http://www.saiga-jp.com/cgi-bin/dic.cgi?m=search&sc=0&f=0&j=)the radical is やね, which is Japanese for roof. I don't think this is one of the traditional 214 radicals (http://kanjialive.com/214-traditional-kanji-radicals/) but it does get used by Henshall in his book "Kanji: Remembering the Japanese Characters".
According to 学研監修漢字辞書 (a real dictionary) the radical is 人 (ひと).
I don't think you can get a definitive answer unless you go by one dictionary: There are several sets of radicals in existence, compiled for different dictionaries (see also note by Choko). Other users of this site can explain etymologies at great length, if that it what you seek.
Personally I used to find radicals quite useful to look up characters but I can live with 全 having both of these as radicals.