Hi Paul,

 

A very detailed comparison of the relative DXing merits of the Tecsun PL-606, PL-310 and PL-380 models is contained in the PL-606 review posted in the Ultralightdx file section, and also at http://www.mediafire.com/view/?gcu6zgyxb724cy2

 

The Tecsun PL-450 (with an excess size and weight) was determined not to qualify for Ultralight radio designation about 3 years ago, so you won't find any reviews for it posted on this site. I did purchase a couple of PL-450's for testing purposes, though, and found them to be slightly more sensitive on AM than the units listed above (because of the longer loopstick). 

 

73 and Good Luck,

Gary DeBock (in Puyallup, WA, USA)