The lowest emission peaks for HCO+ and OH- that I can find in literature are 267.557 GHz and 1612.231 MHz, respectively, but I have not been able to find spectra for lower frequencies. Do either of these have emission peaks below 500 MHz?
Try to find them in the NIST data base. e.g.
http://webbook.nist.gov/cgi/inchi?ID=C3352576&Mask=1000
HCO+ does not have any transitions below 500 MHz; it's fundamental transition is at 89 GHz. By the way, it is not a radical. Think of it as a proton attached to carbon monoxide molecule.
OH- does have a few below 500 MHz, but I don't know how intense they are.
Species Freq.(MHz) Unc. J' - J'' F' F1' - F'' F1'' Vib. Ref.
1H16O 2Pi1/2 88.950 (0.001) 9/2 - 9/2 +4 - -5 0 [73074]
117.150 (0.001) 9/2 - 9/2 +5 - -5 0
164.796 (0.001) 9/2 - 9/2 +4 - -4 0
192.996 (0.001) 9/2 - 9/2 +5 - -4 0
Look at
http://spec.jpl.nasa.gov/ftp/pub/catalog/catform.html
They list HCO+ lines but not OH- lines.
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