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Ok, i got it - pin 3 is RFI - radio frequency IN, not out. If you're going to extend its range as TX, you're supposed to use pin 4.

Are you sure about thinner track being the antenna? Here is the datasheet for A7105 transceiver http://d1.amobbs.com/bbs_upload782111/files_37/ourdev_624976V4QBXF.pdf and on page 65 there is a application diagram. 4th pin is supposed to be leading to the antenna, so these guys seem to be correct.