Unless things have changed recently its not on Digital but more people are listening to  t'internet on smart phones etc - main sessions are on FM but more of the TT stuff is AM - FM reception outside Douglas can be a bit hit and miss - I have a lilltle sony I bought for about £10 in shoprite in little Switlerland make sure you get one with a speaker and headphone jacks - i also got some sony padded headphones so you can hear when the bikes are passing.

if things have changed nodoubt somebody will be along shortly to put me right and cost me more money!