One possiblity, do you have the TV tuner at the moment? if so then Audi have a DVB-T upgrade for analogue tuners, it was designed for the A8 D3 chassis, but there is no reason why it will not integrate with the D1/D2 chassis as long as you have the B tuner with the dual brown and green antenna connectors on the rear.
The DVB module attaches to the aux input of the tuner and is controlled by a remote control on the dash. It is radio control, not IR so it does not need line of sight.
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