|Have you considered using a PowerLine adapter instead? |
They are a cable connect (not Wifi) but use your domestic power supply as the signal cable. You put one on the router and another one on each computer. Even the cheapest ones do quite well.
I'm using one right now and the download speed is no different to when I was using a direct cable and better than Wifi.
Ooops, I missed the magic phrase "portable device". Unless it was kept in fixed locations near a power socket then the above idea would be unsuitable.
Always pop back and let us know the outcome - thanks
message edited by Derek