Chad Johnson averaged the most yards per reception for the Patriots in 2011, with 18.4 per reception.

who was the most yards after catch for the patriots 2011
Interpreted as:
Who was the most yards after catch with a minimum of 0.9375 receptions per team game for the patriots 2011?
2011Johnson2011Gronkowski2011Branch2011Welker2011Hernandez2011Woodhead18.414.713.812.911.58.7
NAMESEASONTMGPREC AVGRECTRGREC YDSREC YDS/GREC TDRUSH YDSATTRUSH AVGRUSH YDS/GRUSH TD
Chad JohnsonChad Johnson2011NENE1518.4153227618.41000.00
Rob GronkowskiRob Gronkowski2011NENE1614.7901241,32782.917212.00.11
Deion BranchDeion Branch2011NENE1513.8519070246.85000.00
Wes WelkerWes Welker2011NENE1612.91221731,56998.193047.51.90
Aaron HernandezAaron Hernandez2011NENE1411.57911391065.074559.03.20
Danny WoodheadDanny Woodhead2011NENE158.7183115710.50351774.623.41
StatMuse has season-level data for receptions per team game and yards per reception going back to the 1932 season.

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