There are drivers available for the airlink adapter, just not from tivo.
Classicsat is right that there is no point, unless you are able to enable jumbo frames. With jumbo frames enabled, there is a performance boost, due to less overhead with fewer, larger ethernet frames [reference]. I routinely get 5-6MB/sec in MRV transfers, which is about double what I used to get with 100mbps adapters.
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