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Hmm. Around here you dont find tabanids, they find you:(

The only tip I can think of is that tabnid larvae develop in wet soil or moss and the adults are most numerous in wetlands. Open fens or fields is generally better than forest. The adults circle their target fast and low, mainly below knee level (especially the larger Hybomitra and Tabanus). Sometimes they are 'clever' and fly mostly behind you, walking slowly backwards while sweeping seems to give better results.