Plus the bolts don’t rust when it’s in the loft. I changed all the bolts on my G17 when I took it down off the external mast. I disassembled it and reassembled with new bolts. The old ones were quite corroded.
I think an external roof mounted G17 looks really cool.
Planning Permission: Houses and buildings up to 15 metres high
Unless your house (or the building in which you live) is in a designated area, you do not need to apply for planning permission to install an antenna on your property, and it falls within the following, you typically won’t require permission.
- there will be no more than two antennas on the property overall. (These may be on the front or back of the building, on the roof, attached to the chimney, or in the garden);
- if you are installing a single antenna, it is not more than 100 centimetres in any linear dimension (not including any projecting feed element, reinforcing rim, mounting and brackets);
- if you are installing two antennas, one is not more than 100 centimetres in any linear dimension, and the other is not more than 60 centimetres in any linear dimension (not including any projecting feed element, reinforcing rim, mounting and brackets);
- the cubic capacity of each individual antenna is not more than 35 litres;
- an antenna fitted onto a chimney stack is not more than 60 centimetres in any linear dimension; and
- an antenna mounted on the roof only sticks out above the roof when there is a chimney-stack. In this case, the antenna should not stick out more than 60 centimetres above the highest part of the roof, or above the highest part of the chimney stack, whichever is lower.
These are typically too limiting for a high gain vhf fm antenna. Limiting 60cms to roof line will typically compromise performance on a horizontally polarised antenna
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