Here is a tutorial on how to repair the Spectrum DX6i transmitter, here are the links to all the parts:
http://www.radioshack.com/product/index.jsp?productId=2062506
http://www.radioshack.com/product/index.jsp?productId=2062554
http://www.radioshack.com/product/index.jsp?productId=2062340
http://www.horizonhobby.com/products/replacement-antenna-dx6i-SPM6830