They also broadcast to Hampshire, Dorset, Wiltshire and Oxfordshire. You may not realise this if you watch on HD TV as that only does the south east, the other version is on Channel 3 rather than cannel 103. One version is done live, the other is pre-recorded by the same presenters and are transmitted at the same time.
Yes, one of their main transmitters is on the Isle-Of-Wight and reaches all the way to Portland and would probably be the choice if you live East of Weymouth, it also is the feed for all of the relays past Dorchester, also the Hannington transmitter that serves the area around Basingstoke, very much in GWR territory.
Noting that the service area for Meridian extends from Portland in the west and all the way to the Thames estuary in the east, encompassing the Rowridge, Hannington, Midhurst, Heathfield, Dover and Bluebell Hill main transmitters.
As for annoying adverts, the current Dyson one that say how great their crappy vacuum is because it has a laser and a sensor that tells you what it's picked up, yeah like a cordless Dyson is going to pick up that much, and any advert for something which is clearly a scam but just this side of legal so that the advert doesn't get pulled