My 5th receiver, a National RF-B60 bought in April 1988 in Japan, is a really good and sensitive receiver. It covers the Medium Wave (522 kHz - 1620 kHz) and has three overlapping Short Wave bands (1711 kHz - 29999 kHz) in 1 or 5 kHz steps. The selectivity is exellent and the reception on short wave is excellent. It also has the Japanese FM-Band (76-108 MHz) and the Air Band (108-137 MHz). There are 9 memory channels for every band (45 in all). The receiver shows good performance, the selectivity is good and the sensitivity is excellent, even if you use the Telescopic Antenna.
The internal LR6 batteries do not last extremely long, so it is advisable to use an external 6 V DC adapter. I am using a Friwo 230V / 3 VA adapter set to 6 Volt output..
There is a choice between a telescopic antenna or an external antenna which is connected via a 3.5 mm plug, there is a DX / LOCal switch, but you need to modify the radio to create a 450 kHz IF output which can be used for the a DRM IF converter.