  In the near future BabyIAXO will be the most powerful axion helioscope,
relying on a custom-made magnet of two bores of 70 cm diameter and 10 m long,
with a total available magnetic volume of more than 7 m$^3$. In this document,
we propose and describe the implementation of low-frequency axion haloscope
setups suitable for operation inside the BabyIAXO magnet. The RADES proposal
has a potential sensitivity to the axion-photon coupling $g_{a\gamma}$ down to
values corresponding to the KSVZ model, in the (currently unexplored) mass
range between 1 and 2$~\mu$eV, after a total effective exposure of 440 days.
This mass range is covered by the use of four differently dimensioned
5-meter-long cavities, equipped with a tuning mechanism based on inner turning
plates. A setup like the one proposed would also allow an exploration of the
same mass range for hidden photons coupled to photons. An additional
complementary apparatus is proposed using LC circuits and exploring the low
energy range ($\sim10^{-4}-10^{-1}~\mu$eV). The setup includes a cryostat and
cooling system to cool down the BabyIAXO bore down to about 5 K, as well as
appropriate low-noise signal amplification and detection chain.
