  Wideband communications are impossible with signals that are spread over a
very large band and are transmitted over multipath channels unknown ahead of
time. This work exploits the I-mmse connection to bound the achievable
data-rate of spreading signals in wideband settings, and to conclude that the
achievable data-rate diminishes as the bandwidth increases due to channel
uncertainty. The result applies to all spreading modulations, i.e. signals that
are evenly spread over the bandwidth available to the communication system,
with SNR smaller than log(W/L)/(W/L) and holds for communications over channels
where the number of paths L is unbounded by sub-linear in the bandwidth W.
