> I modified source to show Ad at the bottom of screen, then use AdMob
> to suite iPad screen as below:

> // AdWhirlAdapterGoogleAdMobAds.m
> // Show AdMob in iPad
> - (void)getAd {
>      ....

>     CGRect frame;
>     CGSize bannerSize;

>     if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
>             bannerSize = GAD_SIZE_728x90;
>     }
>     else {
>         bannerSize = GAD_SIZE_320x50;
>     }

>     frame.size = CGSizeMake(bannerSize.width, bannerSize.height);

>     GADBannerView *view = [[GADBannerView alloc] initWithFrame:frame];

>     // Set the frame for this view to match the bounds of the parent
> adWhirlView.
>    //GADBannerView *view = [[GADBannerView alloc]
> initWithFrame:adWhirlView.bounds];

>     ....
> }

> // Show Ads at bottom of screen
> // YourViewController.m
> - (void)adWhirlDidReceiveAd:(AdWhirlView *)adWhirlView {
>     [UIView beginAnimations:@"AdWhirlDelegate.adWhirlDidReceiveAd:"
> context:nil];

>     [UIView setAnimationDuration:0.7];

>     CGSize adSize = [adWhirlView actualAdSize];
>     CGRect newFrame = adWhirlView.frame;

>     newFrame.size = adSize;
>     newFrame.origin.x = (self.view.bounds.size.width - adSize.width) /
> 2;
>     newFrame.origin.y = self.view.bounds.size.height - adSize.height;

>     adWhirlView.frame = newFrame;

>     [UIView commitAnimations];
> }