It is possible to extend the receiver coverage of both of the above radios without removing the covers!
With the radio turned off, but beep enabled, hold down LAMP, FUNC and V/M buttons while simultaneously turning on the radio. Keep all 3 buttons pressed. The display will fill up with all sections on, then there will be a beep, a longish gap and another beep. Once the second beep is over, release the buttons.
Lo and behold, you now have coverage of any freq from 0 to 1300 MHz, except, of course, that the VCO cannot cover the entire range. For example, the 4SE will cover approximately 380 to 480Mhz plus 805 to about 930MHz.