It's specified as being usable for 25-3000MHz for receive and 50-1200MHz for transmit (200Watts at 144MHz), with a gain of 2dBi, so seemed like a good choice for general SDR usage.
Here's what I measured for S11 using a E5061B VNA, from 20MHz to 3GHz (S11 of -10dB is around a VSWR of 2):
- DISCONE_ROOF_FULL_AVG.PNG (46.32 KiB) Viewed 185 times
And zoomed in at 28MHz:
- DISCONE_ROOF_28MHZ.PNG (54.73 KiB) Viewed 185 times
50MHz:
- DISCONE_ROOF_50MHZ.PNG (52.1 KiB) Viewed 185 times
70MHz:
- DISCONE_ROOF_70MHZ.PNG (52.17 KiB) Viewed 185 times
137MHz:
- DISCONE_ROOF_137MHZ.PNG (53.95 KiB) Viewed 185 times
144MHz:
- DISCONE_ROOF_144MHZ.PNG (59.93 KiB) Viewed 185 times
430MHz:
- DISCONE_ROOF_430MHZ.PNG (53.87 KiB) Viewed 185 times
1090MHz:
- DISCONE_ROOF_1090MHZ.PNG (50.95 KiB) Viewed 185 times
1707MHz:
- DISCONE_ROOF_1707MHZ.PNG (54.17 KiB) Viewed 185 times
Seems to work quite well. So well in fact, the need for filtering becomes more apparent!
Not much good for satellites though, so far, presumably because the radiation pattern has a null vertically upwards, as can be seen in this Matlab Antenna Designer plot (which isn't for the exact antenna, just an approximation)
- DisconeRadiationPatternMatlab.PNG (60.05 KiB) Viewed 185 times