diff --git a/gamutrf/grscan.py b/gamutrf/grscan.py
index 175be885..bda03613 100644
--- a/gamutrf/grscan.py
+++ b/gamutrf/grscan.py
@@ -35,6 +35,7 @@ def __init__(
         bucket_range=1.0,
         colormap=16,
         compass=False,
+        correct_iq=False,
         db_clamp_ceil=50,
         db_clamp_floor=-200,
         dc_block_len=0,
@@ -190,12 +191,11 @@ def __init__(
             fft_processor_affinity,
             low_power_hold_down,
             slew_rx_time,
+            dc_block_len,
+            dc_block_long,
+            correct_iq,
         )
-        self.fft_blocks = (
-            self.get_dc_blocks(dc_block_len, dc_block_long)
-            + self.fft_blocks
-            + self.get_db_blocks(nfft, samp_rate, scaling)
-        )
+        self.fft_blocks = self.fft_blocks + self.get_db_blocks(nfft, samp_rate, scaling)
         self.last_db_block = self.fft_blocks[-1]
         fft_dir = ""
         self.samples_blocks = []
@@ -360,23 +360,18 @@ def __init__(
             )
             if self.iq_inference_block:
                 if iq_inference_squelch_db is not None:
-                    squelch_blocks = [
-                        blocks.vector_to_stream(
-                            gr.sizeof_gr_complex,
-                            fft_batch_size * nfft,
-                        ),
-                        analog.pwr_squelch_cc(
-                            iq_inference_squelch_db,
-                            iq_inference_squelch_alpha,
-                            0,
-                            False,
-                        ),
-                        blocks.stream_to_vector(
-                            gr.sizeof_gr_complex,
-                            fft_batch_size * nfft,
-                        ),
-                        self.iq_inference_block,
-                    ]
+                    squelch_blocks = self.wrap_batch(
+                        [
+                            analog.pwr_squelch_cc(
+                                iq_inference_squelch_db,
+                                iq_inference_squelch_alpha,
+                                0,
+                                False,
+                            )
+                        ],
+                        fft_batch_size,
+                        nfft,
+                    ) + [self.iq_inference_block]
                     self.connect_blocks(self.retune_pre_fft, squelch_blocks)
                 else:
                     self.connect((self.retune_pre_fft, 0), (self.iq_inference_block, 0))
@@ -510,9 +505,34 @@ def get_offload_fft_blocks(
             fft_blocks.append(self.iqtlabs.vector_roll(nfft))
         return fft_batch_size, fft_blocks
 
-    def get_dc_blocks(self, dc_block_len, dc_block_long):
+    def wrap_batch(self, wrap_blocks, fft_batch_size, nfft):
+        # We prefer to deal with vector batches for efficiency, but some blocks
+        # handle only single items. Wrap single-item blocks for batch compatibility
+        # for now until batch-friendly blocks are available.
+        return (
+            [blocks.vector_to_stream(gr.sizeof_gr_complex, fft_batch_size * nfft)]
+            + wrap_blocks
+            + [blocks.stream_to_vector(gr.sizeof_gr_complex, fft_batch_size * nfft)]
+        )
+
+    def get_dc_blocks(
+        self, correct_iq, dc_block_len, dc_block_long, fft_batch_size, nfft
+    ):
+        dc_blocks = []
+        if correct_iq:
+            logging.info("using correct I/Q")
+            dc_blocks.append(blocks.correctiq())
         if dc_block_len:
-            return [grfilter.dc_blocker_cc(dc_block_len, dc_block_long)]
+            logging.info(
+                "using DC block length %u long %s", dc_block_len, dc_block_long
+            )
+            dc_blocks.append(grfilter.dc_blocker_cc(dc_block_len, dc_block_long))
+        if dc_blocks:
+            return self.wrap_batch(
+                dc_blocks,
+                fft_batch_size,
+                nfft,
+            )
         return []
 
     def get_fft_blocks(
@@ -532,6 +552,9 @@ def get_fft_blocks(
         fft_processor_affinity,
         low_power_hold_down,
         slew_rx_time,
+        dc_block_len,
+        dc_block_long,
+        correct_iq,
     ):
         fft_batch_size, fft_blocks = self.get_offload_fft_blocks(
             vkfft,
@@ -554,7 +577,14 @@ def get_fft_blocks(
             low_power_hold_down,
             slew_rx_time,
         )
-        return (fft_batch_size, [self.retune_pre_fft] + fft_blocks)
+        return (
+            fft_batch_size,
+            [self.retune_pre_fft]
+            + self.get_dc_blocks(
+                correct_iq, dc_block_len, dc_block_long, fft_batch_size, nfft
+            )
+            + fft_blocks,
+        )
 
     def start(self):
         super().start()
diff --git a/gamutrf/scan.py b/gamutrf/scan.py
index c92615da..5bfbdc4a 100644
--- a/gamutrf/scan.py
+++ b/gamutrf/scan.py
@@ -273,6 +273,13 @@ def argument_parser():
         action="store_true",
         help="Use dc_block_cc long form",
     )
+    parser.add_argument(
+        "--correct-iq",
+        dest="correct_iq",
+        default=False,
+        action=BooleanOptionalAction,
+        help="Use correct I/Q",
+    )
     parser.add_argument(
         "--ettus-dc-offset",
         dest="dc_ettus_auto_offset",