If your Neurio is reporting that the wireless signal is less than 2 bars, ensure that the antenna and all other cables are solidly connected to your Neurio. Also ensure your antenna is outside of your panel (using the provided antenna mounts). If that doesn’t help, use another wireless device such as your smartphone next to your Neurio and see if it reports similar signal strength at that same distance.
If using your smartphone you can verify that the wireless signal is in fact weak (less than 2 bars), it is recommended to use signal range extenders to improve the signal strength. One example is Netgear WN2000RPTv2 (and TP-LINK TL-WR702N).