Hello Everyone I am just interested just how the above receivers compare, I know the SW-4A is AM only but is it very sensisitive? How does the SPR-4 compare with the R-4C. I would like to hear from someone who has used all, pros and cons. If you had to replace the MFE-3007 used in the SPR-4 what would you use. Thanks in advance. 73 Lee VK5ABC