Signature investment menu
cost 0/10 · weight 0/5
The trap: the obvious buy is X-band RAM (A) — but the limiter is the VHF surveillance radar, which A barely touches. The lever: spend at the limiter — find which menu rows actually move VHF.
Detection range Rdet = max band
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Threat detection range — baseline vs package (km)

Baseline This package Loudest band (Rdet)
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Rdet = max(RVHF, RX, RIR): survivability is set by the loudest band, so a package only helps if it lowers the tallest bar. Radars follow R ∝ σ1/4 — it takes ~12 dB just to halve a range — so decibels spent off the limiter are wasted.
Aircraft heading
Heading0°
Each threat sees the aspect bearing(B-21→threat) − heading, wrapped 0–360°. The embedded 72-row pattern is interpolated at that aspect, the same selected package dB reductions are applied, and the threat's law turns it into a detection range. Ring is red if it holds a track, green if safe.
Package: baseline (no investments selected). Switch to the Trade-study tab to change it — the aspect view uses the same package.
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Top-down plan view — three threats at fixed bearings (km)

Threat holds a track Safe (outside detection ring) B-21 heading
Per-threat exposure at this heading
ThreatAspectSignatureR_det (km)Range (km)
Orientation is survivability. A nose-on ingress hands the low-RCS nose to the two forward radars; a tail-on egress would present the hot stern straight to the MANPADS. The same package that wins the budget on Tab 1 shrinks every ring here — but no heading hides you from all three at once.