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Using data from https://ned.ipac.caltech.edu/, I can get nice-looking spectral energy distributions for quasars, such as for these two: enter image description here enter image description here

but most of their points are in UV to IR range. I'm looking particularly for quasars with lots of radio points (i.e. frequency < 1e12 Hz), since that's the region I'm using in my research.

In the link above, you search for objects by name, but I don't know the names of any quasars with lots of points in the radio range. Are there any known like this? I only need a couple, as examples in my report.

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If you're looking explicitly for radio-loud quasars, I'd recommend looking at a catalog of (mainly extragalactic) radio sources, rather than a catalog of quasars, given that only a small fraction of quasars are radio-loud.

The Third Cambridge Catalogue of Radio Sources (VizieR link) might be a nice starting point, particularly given how many objects are referred to by their 3C designation, although not all of the objects listed there are quasars - there are plenty of Seyfert galaxies and a small number of pulsars. As an example, here's the NED entry for the quasar 3C 286, along with its SED:

SED of quasar 3C 286

The 3C survey was conducted at 159 MHz and then 178 MHz, so you'll certainly see lots of very low-frequency sources in there, which sounds ideal for your purposes. Again, though, this is just a starting point, and your mileage may vary if you opt for other catalogs.

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