diff --git a/Version.py b/Version.py
new file mode 100644
index 0000000..305429b
--- /dev/null
+++ b/Version.py
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+#  NanoVNASaver
+#
+#  A python program to view and export Touchstone data from a NanoVNA
+#  Copyright (C) 2019, 2020  Rune B. Broberg
+#  Copyright (C) 2020 NanoVNA-Saver Authors
+#
+#  This program is free software: you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation, either version 3 of the License, or
+#  (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+import logging
+import re
+import typing
+from typing import List, Tuple
+
+from PyQt5 import QtCore, QtGui
+from PyQt5.QtCore import QModelIndex
+
+logger = logging.getLogger(__name__)
+
+
+class BandsModel(QtCore.QAbstractTableModel):
+    bands: List[Tuple[str, int, int]] = []
+    enabled = False
+    color = QtGui.QColor(128, 128, 128, 48)
+
+    # These bands correspond broadly to the Danish Amateur Radio allocation
+    default_bands = ["2200 m;135700;137800",
+                     "630 m;472000;479000",
+                     "160 m;1800000;2000000",
+                     "80 m;3500000;3800000",
+                     "60 m;5250000;5450000",
+                     "40 m;7000000;7200000",
+                     "30 m;10100000;10150000",
+                     "20 m;14000000;14350000",
+                     "17 m;18068000;18168000",
+                     "15 m;21000000;21450000",
+                     "12 m;24890000;24990000",
+                     "10 m;28000000;29700000",
+                     "6 m;50000000;52000000",
+                     "4 m;69887500;70512500",
+                     "2 m;144000000;146000000",
+                     "70 cm;432000000;438000000",
+                     "23 cm;1240000000;1300000000",
+                     "13 cm;2320000000;2450000000"]
+
+    def __init__(self):
+        super().__init__()
+        self.settings = QtCore.QSettings(QtCore.QSettings.IniFormat,
+                                         QtCore.QSettings.UserScope,
+                                         "NanoVNASaver", "Bands")
+        self.settings.setIniCodec("UTF-8")
+        self.enabled = self.settings.value("ShowBands", False, bool)
+
+        stored_bands: List[str] = self.settings.value("bands", self.default_bands)
+        if stored_bands:
+            for b in stored_bands:
+                (name, start, end) = b.split(";")
+                self.bands.append((name, int(start), int(end)))
+
+    def saveSettings(self):
+        stored_bands = []
+        for b in self.bands:
+            stored_bands.append(b[0] + ";" + str(b[1]) + ";" + str(b[2]))
+        self.settings.setValue("bands", stored_bands)
+        self.settings.sync()
+
+    def resetBands(self):
+        self.bands = []
+        for b in self.default_bands:
+            (name, start, end) = b.split(";")
+            self.bands.append((name, int(start), int(end)))
+        self.layoutChanged.emit()
+        self.saveSettings()
+
+    def columnCount(self, parent: QModelIndex = ...) -> int:
+        return 3
+
+    def rowCount(self, parent: QModelIndex = ...) -> int:
+        return len(self.bands)
+
+    def data(self, index: QModelIndex, role: int = ...) -> QtCore.QVariant:
+        if (role == QtCore.Qt.DisplayRole or
+                role == QtCore.Qt.ItemDataRole or role == QtCore.Qt.EditRole):
+            return QtCore.QVariant(self.bands[index.row()][index.column()])
+        if role == QtCore.Qt.TextAlignmentRole:
+            if index.column() == 0:
+                return QtCore.QVariant(QtCore.Qt.AlignCenter)
+            return QtCore.QVariant(QtCore.Qt.AlignRight | QtCore.Qt.AlignVCenter)
+        return QtCore.QVariant()
+
+    def setData(self, index: QModelIndex, value: typing.Any, role: int = ...) -> bool:
+        if role == QtCore.Qt.EditRole and index.isValid():
+            t = self.bands[index.row()]
+            name = t[0]
+            start = t[1]
+            end = t[2]
+            if index.column() == 0:
+                name = value
+            elif index.column() == 1:
+                start = value
+            elif index.column() == 2:
+                end = value
+            self.bands[index.row()] = (name, start, end)
+            self.dataChanged.emit(index, index)
+            self.saveSettings()
+            return True
+        return False
+
+    def index(self, row: int, column: int, parent: QModelIndex = ...) -> QModelIndex:
+        return self.createIndex(row, column)
+
+    def addRow(self):
+        self.bands.append(("New", 0, 0))
+        self.dataChanged.emit(self.index(len(self.bands), 0), self.index(len(self.bands), 2))
+        self.layoutChanged.emit()
+
+    def removeRow(self, row: int, parent: QModelIndex = ...) -> bool:
+        self.bands.remove(self.bands[row])
+        self.layoutChanged.emit()
+        self.saveSettings()
+        return True
+
+    def headerData(self, section: int,
+                   orientation: QtCore.Qt.Orientation, role: int = ...):
+        if (role == QtCore.Qt.DisplayRole and
+                orientation == QtCore.Qt.Horizontal):
+            if section == 0:
+                return "Band"
+            if section == 1:
+                return "Start (Hz)"
+            if section == 2:
+                return "End (Hz)"
+            return "Invalid"
+        super().headerData(section, orientation, role)
+
+    def flags(self, index: QModelIndex) -> QtCore.Qt.ItemFlags:
+        if index.isValid():
+            return QtCore.Qt.ItemFlags(
+                QtCore.Qt.ItemIsEditable |
+                QtCore.Qt.ItemIsEnabled |
+                QtCore.Qt.ItemIsSelectable)
+        super().flags(index)
+
+    def setColor(self, color):
+        self.color = color
+
+
+class Version:
+    RXP = re.compile(r"""^
+        \D*
+        (?P<major>\d+)\.
+        (?P<minor>\d+)\.
+        (?P<revision>\d+)
+        (?P<note>.*)
+        $""", re.VERBOSE)
+
+    def __init__(self, vstring: str = "0.0.0"):
+        self.data = {
+            "major": 0,
+            "minor": 0,
+            "revision": 0,
+            "note": "",
+        }
+        try:
+            self.data = Version.RXP.search(vstring).groupdict()
+            for name in ("major", "minor", "revision"):
+                self.data[name] = int(self.data[name])
+        except AttributeError:
+            logger.error("Unable to parse version: %s", vstring)
+
+    def __gt__(self, other: "Version") -> bool:
+        l, r = self.data, other.data
+        for name in ("major", "minor", "revision"):
+            if l[name] > r[name]:
+                return True
+            if l[name] < r[name]:
+                return False
+        return False
+
+    def __lt__(self, other: "Version") -> bool:
+        return other > self
+
+    def __ge__(self, other: "Version") -> bool:
+        return self > other or self == other
+
+    def __le__(self, other: "Version") -> bool:
+        return self < other or self == other
+
+    def __eq__(self, other: "Version") -> bool:
+        return self.data == other.data
+
+    def __str__(self) -> str:
+        return (f'{self.data["major"]}.{self.data["minor"]}'
+                f'.{self.data["revision"]}{self.data["note"]}')
+
+    @property
+    def major(self) -> int:
+        return self.data["major"]
+
+    @property
+    def minor(self) -> int:
+        return self.data["minor"]
+
+    @property
+    def revision(self) -> int:
+        return self.data["revision"]
+
+    @property
+    def note(self) -> str:
+        return self.data["note"]