Thank you all for your feedback, however i do sens some hesitation or in some cases preference for vertical/outside installations.

The problem is that antenna will run close to battery cables or other electronic devices. What would be the closest or i should say what should be the minimum clearance around the areal.

One place i thought of is on top of the Kevlar tank (cylinder). Would it be possible or will Kevlar creat some noise??

CARS II,

In my setup i have RX and turbine components as per your description.

Dig it,

Although i do not have Carbon fiber inside the XL, i am still worried about the electronics around.

Ehab,

I am leaving the vertical solution for last.

Mr. Mike,

You got me worried about the signal nulls, but isn't this supposed to happen even with wire antenna installed inside fuselage (Giant planes).

Thanks for your input.
Best regards

Dany