I need several quadrature hybrids (i.e. a 90 degree two-way splitter)
for use in portions of the 0.5 to 2.0 MHz band. This is for a
low-power phasing scheme. Normally I would obtain them from some place
like Mini-Circuit but some reason they only offer a 1.13 to 1.38 MHz
model (PSCQ-2-1.25). Can anyone suggest a source of supply?

Suppose I could also build them but am not familiar with the
construction techniques used at these low frequencies. Am more
accustomed to stripline and microstrip at VHF and UHF. Any suggestions
here would be appreciated. I am sure the techniques are well known and
must be covered in some articles, books and/or web sites.