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The Tallysman TW2406/TW2408 is an impressive GPS/GLONASS OEM antenna that provides that highest accuracy of any antenna in its size range. Electronically identical to the TW2405, this Tallysman antenna has a larger PCB with drilled holes that provide a more secure mounting method. The TW2408 version includes a tight pre-filter to protect against saturation by high-level sub-harmonics and L-Band signals.