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We present a broadband map of polarized diffuse emission at 167-198 MHzdeveloped from data from the Murchison Widefield Array (MWA). The map isdesigned to improve visibility simulation and precision calibration for 21 cmEpoch of Reionization (EoR) experiments. It covers a large swath - 11,000 sq.deg. - of the Southern Hemisphere sky in all four Stokes parameters andcaptures emission on angular scales of 1 to 9 degrees. The band-averageddiffuse structure is predominantly unpolarized but has significant linearlypolarized structure near RA = 0 h. We evaluate the accuracy of the map bycombining it with the GLEAM catalog and simulating an observation from the MWA,demonstrating that the accuracy of the short baselines (6.1-50 wavelengths) nowapproaches the accuracy of the longer baselines typically used for EoRcalibration. We discuss how to use the map for visibility simulation for avariety of interferometric arrays. The map has potential to improve calibrationaccuracy for experiments such as the Hydrogen Epoch of Reionization Array(HERA) and the forthcoming Square Kilometre Array (SKA) as well as the MWA.

A Map of Diffuse Radio Emission at 182 MHz to Enhance Epoch of Reionization Observations in the Southern Hemisphere