EchoStar Over-the-Air Module MT2 User Manual page 5

The module port on the back of the satellite receiver must be
covered if an OTA Module is not installed. Damage to an
uncovered module port is not covered by the receiver's
Limited Warranty.
3. Install the module into the module port, making sure the labeling on
the module is right-side up. Attach the module using the two cover
screws (see Figure 2).
Note : Save the module port cover in case you need to remove the
module and cover the port in the future.
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Figure 2. Installing the MT2 OTA Module