I am using a 2.4 ghz radio in my tamiya 2a6 build, my question is do i have to connect the antenna lead to the tanks exterior antenna .THANKS

NO, 1 or 2 " will do.
Darryl

With 2.4, there is no need for an external antenna. The reciever wires should be spread out in two directions inside the hull, but honestly, I have never encountered a problem, no matter how I have them in the tank.  It probably makes a difference if you are using a long range, like in aircraft, but for tanks, I see no difference.

There is no need with 2.4 systems as the antenna is short due to the wavelength.

The reciever has two antennae for a dipole arrangement, modifying one will affect the ability to pick-up signal.

HI Thanks for the info, the tamiya 2a6 is my first tank build I am use to RC cars & trucks and tanks are more interesting . THANKSAGAIN

However, if you ever decide to waterproof your tank & take it 4+ inches underwater, you might run into signal issues...

Hi:
I also am doing the 2A6 Leopard and I am waiting for my DMD T-07 controler to arrive so I can test my set up.
I belong to the CAN-AM RC Tank club in Fort Erie. We are about 12-18 members and meet once a month on apatch of ground behind the Black Creek Community Centre ( This Saturday if it does not rain) ( www.can-amrctankclub.blogspot.ca )
We have a lot of fun and we would be glad to have you come.
We have members from Toroto, Hamilton, Windsor and Kitchener as well as St. Catharines etc.
PM me if you want more info.

Wayne

Wayna I am going to try an make it depends on rain .bye steve

Steve:
The rumourmongers and the weather network are saying 90 % chance of rain tomorrow but the weather radar map looks as if two wet weather fronts are paralleling a path down both side of us.I will be there from ( 9::00 Am to 1:00 PM ) most stay to 4:305:00 to clean up if the whole battle scene / town has been set up.
I have to drive my son his wife and daughter to the airort so I will be leaving early.

Steve:
Saturday has been canceled we are going to try Sunday at 10:00 AM

Wayne