One example of last night 80m session. As usual all levels are normalized to 1W. Apparently my 80m portable antenna is working fine... 
The portable antenna, just a bit shorter (16.5m) than my home one, but built on the same principle (see the best of this blog). Built with a light telesopic mast, a steppIR fiber element, and a a light fishing rod. 
Just a dozen of 10m radials laying on the ground, enough to get the radiation resistance close to 28 ohms on 80m. Matching is just done by a serial coil and 28/50 ohms UNUN. 
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