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This document presents a parametric model to help design an Interferometric Array. It focuses in the value vs. cost trade-off inherent to many of its architecture definitions. This is a Multiple Objective problem. This document describes design parameters to consider in \S~\ref{sec:var} and a set of equations for research and cost objectives in \S~\ref{sec:obj}.   A spreadsheet that uses these design parameters and produces a CSV file for analysis of the emerging Pareto Front is introduced in \S~\ref{sec:spreadsheet}. This output enables the of Multiple Objective Visual Analytics (MOVA) for complex engineered systems as proposed in \cite{mova}.  \section{Parameters}\label{sec:var}  This section presents selected design parameters that influence selected objectives in \S~\ref{sec:obj}. We will select design parameters that are specification agnostic. As an example of this, the parameters will be relevant to multiple antenna specifications, including offset Gregorian and symmetric Cassegrain.  \subsection{Antenna Parameters}  We will select design parameters that apply to many antenna types, including offset Gregorian and symmetric Cassegrain.   \subsubsection{Antenna Collecting Area}  We will use $A$ in this document as each array element collecting area (thus we could also write $\pi \cdot D^2$, with $D$ being the dish diameter).  \subsubsection{Antenna Efficiency}