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For immediate release: June 20, 2006

MDA Signs Up New RADARSAT Information Reception Station

Richmond, B.C. - MacDonald, Dettwiler and Associates Ltd. (TSX: MDA), a provider of essential information solutions, announced today the signing of a new RADARSAT satellite information reception station in Italy. The new station - MARSec - joins a global network of over 27 RADARSAT-1 receiving stations.

In addition to the new station sign-up, MDA announced the signing of over $4 million CAD worth of renewal agreements with existing network station clients.

Participating stations in the global ground receiving station network are distributed all across the globe. This allows MDA and its partners to offer near-real time data delivery, whereby clients anywhere in the world can typically receive data less than four hours after the area of interest is observed and the information downlinked by the over-passing satellite.

Near-real time delivery of fully processed imagery supports critical operations such as identifying illegal fishing activity, detecting illegal bilge dumping, ice mapping and tracking for ship navigation, and monitoring of disasters such as floods and earthquakes.

About MDA

MDA provides advanced information solutions that capture and process vast amounts of data, produce essential information, and improve the decision making and operational performance of business and government organizations worldwide.

Focused on markets and customers with strong repeat business potential, MDA delivers a broad spectrum of earth and space based information solutions, ranging from complex operational systems, to tailored information services, to electronic information products.

MDA employs more than 2,700 people in locations across the United States, the United Kingdom, and Canada. The Company's common shares trade on the Toronto Stock Exchange under the symbol TSX:MDA.

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Forward-Looking Statements

This release contains forward-looking statements and information, which reflect the current view of MacDonald, Dettwiler and Associates Ltd. with respect to future events and financial performance. Any such forward-looking statements are subject to risks and uncertainties and MDA's actual results of operations could differ materially from historical results or current expectations. Additional information on these and other potential factors that could affect MDA's financial results are detailed in documents filed from time to time with the applicable Canadian securities regulatory authorities.

The Toronto Stock Exchange has neither approved nor disapproved the form or content of this release.

For more information, please contact:

Wendy Keyzer
MDA External Relations
Telephone: 604-231-2743

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