Adding advertising into template...

I'm hoping someone can help with the following.

I'm trying to add some google ads into the arcade template.

I've created a php file including the code and then set the following plugin:

ob_start();
include('path/to/forums/google.php');
$google = ob_get_contents();
ob_end_clean();

I've tried using the global_start hook for this but that didn't work so then I tried the ibproarcade_global_start hook but it's still not working.

Any ideas which hook I should be using?

I've just tried adding $google into the ARCADE template but obviously this depends where I add it as to what other code I need. Ideally it'd be between the arcade navbar and the main content.

[RobParker]

No one? I'd have thought this one would be fairly simple...

[RobParker]

Bump in the hope that someone understands what I'm asking.