As i really enjoy using the 10m band and sometimes the 11m band to talk with friends around Athens, it came as a must of constructing a new antenna. Also i wanted to do this because i have an Albrecht 5890EU ,which operates in these frequencies and i didn't have an extra antenna to operate it.
Due to the lack of space in my QTH(that is why i 'm using the long wire + UnUn antenna), i was trying to find a solution of a vertical polarization antenna ,with high efficiency and as small as possible.
As supplied by Yaesu, the FT-817
doesn't include an antenna for HF band operation. One of the first
products introduced to address this problem was the Watson ATX Walkabout
antenna. This is sold by UK dealers Waters and Stanton PLC in the UK,
and by MFJ in the US. The antenna is believed to be a Mizuho design,
made under license for Waters and Stanton by Sandpiper Antennas in
Wales. Alternatives have since appeared promising miracles, but the ATX
Walkabout is still the best portable whip antenna for the 817, as well as being the least expensive.