It can work well, however it depends on the construction of your home.I'm thinking about the magmount idea. Seems too easy. I just don't know what my range could be from inside the house. I'm hoping to do the same for a scanner antenna and then split it to 2 scanners.
Metal siding, foil backed insulation/vapor barrier, plaster with metal lath, hvac ducts, wiring, copper pipes, low "e" glass, all attenuate RF and can impact reception. Also, it puts your antenna close to a lot of the noise sources.
If you are transmitting with this setup, it can cause issues with high RF levels impacting appliances, alarm systems, fire alarms, etc.
Give it a try and see how it works, but use low power until you figure out how much power you can use without causing issues.