Update README.md

README.md

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-# QFHMIX01E -  QFH active antenna mixer
+# QFHMIX01 -  QFH active antenna mixer
 
+The module was designed to solve the issue of connecting the [QFH antenna](https://en.wikipedia.org/wiki/Helical_antenna) (which has two orthogonally-phased outputs) to an SDR receiver.
 
 ![QFHMIX01D board bottom ](doc/src/img/QFHMIX01E_bottom.jpg)
 
-
 ## Parameters
 
 | Parameter | Value | Description |