Sounds like your connected to a host wireless access point which is located else where. In this case the 655 can't not be set up in this way as it needs a wired connection to a host modem. It can be turned into a AP however it still needs a wired connection to the host router or AP. This router can't repeat either meaning wirelessly connecting to another wireless AP and thus repeating that signal with out a wired cable. To do this you'd need a DLink DAP model AP that can connect wirelessly to a host AP device and repeat it or act as a bridge.
I would recommend checking out the DLink DAP models, 1360, 1522. I don't think the DAP-1525 repeats though. Any questions, contact DLink Sales office and they'll know a good model for you to use.