// Get the root ad unit ID used to target the whole site.
String rootAdUnitId = networkService.getCurrentNetwork().getEffectiveRootAdUnitId();
// Create inventory targeting.
InventoryTargeting inventoryTargeting = new InventoryTargeting();
// Create ad unit targeting for the root ad unit (i.e. the whole network).
AdUnitTargeting adUnitTargeting = new AdUnitTargeting();
adUnitTargeting.setAdUnitId(rootAdUnitId);
adUnitTargeting.setIncludeDescendants(true);
inventoryTargeting.setTargetedAdUnits(new AdUnitTargeting[] {adUnitTargeting});
// Create geographical targeting.
GeoTargeting geoTargeting = new GeoTargeting();
// Include the US, Quebec, Canada, and the B3P Canada postal code.