Hi
I found the specification data sheet for this old Satellite M105 series:
Satellite M105-S1021
It looks like the notebook was equipped with an Atheros 802.11 b/g Wlan card.
If your internal Wlan card does not work, even if you has enabled the external WLan switch, then I would recommend checking the device manager firstly… check the Network Adapters area for Wlan card… usually the Atheros Wlan card should be listed there… if its not listed, install the Atheros Wlan driver…
Furthermore beside the Wlan hardware switch, you have to enable the WLan using Fn + F8 …
Regarding the USB dongle and low Wlan signal:
Well, possibly the USB dongle antenna signal is too weak… at the other hand you should test the connectivity using 802.11 B or 802.11 G standard only…