Of American and British channels supposedly in 720P, I found 46 channels in SD.
In SD..FS2(151), NBCSN(159), Fight Network(162), Eurosport 1(405), Eurosport 2(406), Sky Sports 5(414), Olympic (402), Sky Sports Mix(407),
A&E(118), Bravo(129), E!(114), Lifetime(108), Sundance(126), SYFY(122), TNT(138), USA(105), Yesterday(187), 4 Seven(83),5 USA(104), Alibi(95), BBC Four(102),
CBS Action(130), CBS Drama(199), CBS Reality(198), Challenge(94), Dave(89), Channel 4(84), Gold(88), ITV(78), ITV 3(80),
ITV 4(81), ITV Encore(137), Pick(96), Really(254), Fox News(205), MSNBC(209), Eden(188), CBS NY(8101), Fox NY(8103), BBC World News(222),
Box Nation(409), ESPN(140), ESPN 2(143), NFL(154), Fox Sports 1(150), Fox Sports 2(151).
In SD..FS2(151), NBCSN(159), Fight Network(162), Eurosport 1(405), Eurosport 2(406), Sky Sports 5(414), Olympic (402), Sky Sports Mix(407),
A&E(118), Bravo(129), E!(114), Lifetime(108), Sundance(126), SYFY(122), TNT(138), USA(105), Yesterday(187), 4 Seven(83),5 USA(104), Alibi(95), BBC Four(102),
CBS Action(130), CBS Drama(199), CBS Reality(198), Challenge(94), Dave(89), Channel 4(84), Gold(88), ITV(78), ITV 3(80),
ITV 4(81), ITV Encore(137), Pick(96), Really(254), Fox News(205), MSNBC(209), Eden(188), CBS NY(8101), Fox NY(8103), BBC World News(222),
Box Nation(409), ESPN(140), ESPN 2(143), NFL(154), Fox Sports 1(150), Fox Sports 2(151).