The following table is based on The measurement of large antennas with cosmic radio sources (sorry for the paywall), Table I "Radio Sources for Antenna Measurements", Panel A "Flux Density and Polarization Data". This table contains some of the brightest "point sources" at microwave frequencies. I have extracted only the flux densities at 1 GHz to match the requested frequency range in the question. Flux densities below 1 GHz will be different.
Source |
Flux Density (fu) |
Cassiopeia A (Cas A, 3C461) |
3185 $\pm$ 30 |
Cygnus A (Cyg A, 3C405) |
2270 |
Taurus A (Tau A, 3C144) |
986 $\pm$ 12 |
Virgo A (Vir A, 3C274) |
285 $\pm$ 5 |
Orion A (Ori A, 3C145) |
330 |
Hydra A (3C218) |
60 |
Hercules A (3C348) |
62 |
3C353 |
73 |
DR21 |
4 |
1 fu = 10-26 Wm-2 Hz-1 = 1 Jy
Locations are epoch 1950.0.
For a home system these are still likely to be very small signals. Using the sun as a reference source may be a better choice even though it is "extended" and the location changes rapidly. Whether you consider it extended or not of course depends on your angular resolution.