Need help arranging icons on Main Activity

Hello Experts,

My main activity has 4 icons and I'd like to have them organized.  Currently, they are not per my screenshots.  Any help to accomplish the layout on the right side in the attached file would be very much appreciated.

Here is my code:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@drawable/background"
    android:baselineAligned="_baseline"
    android:focusable="true"
    android:orientation="horizontal"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".Main" >

    <ImageButton
        android:id="@+id/news"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginRight="28dp"
        android:layout_marginTop="56dp"
        android:background="@drawable/news"
        android:contentDescription="@string/Contact"
        android:src="@drawable/news" />

    <ImageButton
        android:id="@+id/contact"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginRight="18dp"
        android:background="@drawable/contact"
        android:contentDescription="@string/News"
        android:src="@drawable/contact" />

    <ImageButton
        android:id="@+id/locations"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/locations"
        android:contentDescription="@string/Parks"
        android:src="@drawable/locations" />

    <ImageButton
        android:id="@+id/schedules"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/schedules"
        android:contentDescription="@string/schedules" />

</LinearLayout>

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Arranging-Icons-on-Main.png