Landships II

Digging aroundrecently on the subject of wireless tanks I found the standard pictures of a Mk female converted to a wireless tank with an enormous pole aerial. However I also found several references to the possibility that most (if not all) the wireless tanks used at Ypres and 1st Cambrai were in fact Mk IVs - the Mk I wireless tanks being only used for training.

1) can anyone confirm this? and if so ....
2) what did the Mk IV wireless tank look like? Unlikely to be female as the sponsons would have been too small?
3) At the end of 1917 a new British army radio set was introduced using the new 'ring' technology that made it much lighter (man portable - just) and removed the need for a vast tall aerial. I've seen one oblique reference to this being fitted in some tanks. Can any one confirm?
4) There is credible evidence that Mk V* wireless tank(s) being used in action by the Americans. Does any one know what it/they looked like and what radio was used?
5) What radio was fited in the Renault TF command tank?