It has gain all right. I feared that the semi-local Loran C transmitter (250 kW on 100 kHz 14 km away) would make trouble when I connected the Z1501 to my Winradio Excalibur SDR. The Excalibur has no band pass filters or preselectors, so in principle it is wide open.
I was right. I got ADC clipping and needed to attenuate 12 dB to get rid of it. I assume though, that conventional receivers with band pass filters or tracking preselectors will not be affected. Anyway I am used to Loran C trouble, so I have a suite of 100 kHz notch filters, one of which was inserted between the DC Coupler and the Excalibur. Loran C gone.
To compare with the Mini-Whip, I mounted the latter at the same height as the Z1501 enclosure and ran a few tests.
|Mini-Whip MW Response|
|Z1501 MW Response|
And I still haven't put the 3 meter whip on...