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More than 90% of the known Milky Way supernova remnants are within 5 degreesof the Galactic Plane. We present the discovery of the supernova remnantG181.1+9.5, a new high-latitude SNR, serendipitously discovered in an ongoingsurvey of the Galactic Anti-centre High-Velocity Cloud complex, observed withthe DRAO Synthesis Telescope in the 21~cm radio continuum and HI spectral line.We use radio continuum observations (including the linearly polarizedcomponent) at 1420~MHz (observed with the DRAO ST) and 4850~MHz (observed withthe Effelsberg 100-m radio telescope) to map G181.1+9.5 and determine itsnature as a SNR. High-resolution 21~cm HI line observations and HI emission andabsorption spectra reveal the physical characteristics of its localinterstellar environment. Finally, we estimate the basic physical parameters ofG181.1+9.5 using models for highly-evolved SNRs. G181.1+9.5 has a circularshell-like morphology with a radius of about 16~pc at a distance of 1.5 kpcsome 250 pc above the mid-plane. The radio observations reveal highly linearlypolarized emission with a non-thermal spectrum. Archival ROSAT X-ray datareveal high-energy emission from the interior of G181.1+9.5 indicative of thepresence of shock-heated ejecta. The SNR is in the advanced radiative phase ofSNR evolution, expanding into the HVC inter-cloud medium with a density of1$~cm$^{-3}$. Basic physical attributes of G181.1+9.5 calculated with radiativeSNR models show an upper-limit age of 16,000 years, a swept-up mass of morethan 300 solar masses, and an ambient density in agreement with that estimatedfrom HI observations. G181.1+9.5 shows all characteristics of a typical matureshell-type SNR, but its observed faintness is unusual and requires furtherstudy.

G181.1+9.5, a new high-latitude low-surface brightness supernova remnant