[Elecraft] KX1 antenna ideas for 80-40-30-20?

[quaverman1 at netzero.com]

When Elecraft came out with the 30/80 board to increase operating bands to 80,40,30 &20, I bought the mod and the AT kit that goes with the KX1.  They haven't arrived yet so I still have time to think about antennas for portable-backpacking.  The usual 29' wire with the 16' counterpoise would work well with 40,30 & 20.  80 presents a problem as SWR would be quite high ebven with the ATU.  Other than building a seperate 80M antenna, anyone have any ideas for one antenna for all bands with decent SWR?