The radio spectrum appears mostly flat above 1 GHz and the properties are similar to BL Lacertae.

X-ray and gamma-ray emission was found to be steady from this source, whereas it displayed extreme variability in radio and optical bands.

[9] Radio images of this object produced via very long baseline interferometry show a compact core with a jet that extends toward the northeast.

Neutrino event 211208A was detected by the IceCube observatory and a best fit location was found within 2.2° of PKS 0735+178.

[10] This observation occurred while PKS 0735+178 was undergoing a particularly strong flare event that was detected in the optical, ultraviolet, X-ray, and gamma-ray bands.