Be careful using an external antenna with the EXT antenna jack. Perhaps clip a wire to the whip antenna instead.
There have been at least two or three DXers who have said their PL-880's went deaf on SW, and one of them discovered that the EXT jack doesn't have protection diodes, while the whip antenna does.
I plan on getting a PL-880 later in the year. I clip my antenna to the whip antennas on all of my radios, and that method seems to work well.