iAD size is portrait in landscape - ios

Question

I want to implement an iAd at the bottom of my screen. My app runs in landscape mode only, but the iAd is in portrait mode, its too big and I want it correct.
I instantiate it with this :
ADBannerView *adView = [[ADBannerView alloc] initWithFrame:CGRectMake(0, self.view.frame.size.height - 50, 480, 32)];
[self.view addSubview:adView];
So i give it 480 x 32 but it is in 360x 50.
That makes no sense to me and I don't know what to do. In the other topic I read I have to disable Auto Layout, but it is disabled.
thanks for any help!
edit: even if I add the iAd via storyboard to the view in landscape format, it shows it in portrait format when i run the app.
edit: I think I don't have a ADBannerView Appdelegate method.
All I have for my iAd is :
GameViewcontroller.h
#interface GameViewController : UIViewController<ADBannerViewDelegate>
GameViewcontroller.m
#interface GameViewController ()
{
BOOL _bannerIsVisible;
ADBannerView *_adBanner;
}
-(void)viewDidAppear:(BOOL)animated{
[super viewDidAppear:animated];
_adBanner = [[ADBannerView alloc] initWithFrame:CGRectMake((self.view.frame.size.width /2) - 180, self.view.frame.size.height, 480, 32)];
_adBanner.delegate = self;
[self.view addSubview:_adBanner];
}
- (void)bannerViewDidLoadAd:(ADBannerView *)banner
{
if (!_bannerIsVisible)
{
// If banner isn't part of view hierarchy, add it
if (_adBanner.superview == nil)
{
[self.view addSubview:_adBanner];
}
[UIView beginAnimations:#"animateAdBannerOn" context:NULL];
// Assumes the banner view is just off the bottom of the screen.
banner.frame = CGRectOffset(banner.frame, 0, - banner.frame.size.height);
[UIView commitAnimations];
_bannerIsVisible = YES;
}
}
- (void)bannerView:(ADBannerView *)banner didFailToReceiveAdWithError: (NSError *)error
{
NSLog(#"Failed to retrieve ad");
if (_bannerIsVisible)
{
[UIView beginAnimations:#"animateAdBannerOff" context:NULL];
// Assumes the banner view is placed at the bottom of the screen.
banner.frame = CGRectOffset(banner.frame, 0, banner.frame.size.height);
[UIView commitAnimations];
_bannerIsVisible = NO;
}
}